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Gonna change the oil
With few people at work, its hard to get much done. Today I woulda got
more done on the boat but spent it at work. I'll go to the boat to change the oil and engine zinc on my Yanmar 2GM tomorrow. Tried to find some 600 ohm resistors at Radio Shack for my homemade ultra-bright LED anchor light but no luck, will havta order em. |
Gonna change the oil
wrote in message oups.com... With few people at work, its hard to get much done. Today I woulda got more done on the boat but spent it at work. I'll go to the boat to change the oil and engine zinc on my Yanmar 2GM tomorrow. Tried to find some 600 ohm resistors at Radio Shack for my homemade ultra-bright LED anchor light but no luck, will havta order em. How much less power draw will that new LED anchor light have over a standard 12v light? |
Gonna change the oil
" JimH" wrote in message . .. wrote in message oups.com... With few people at work, its hard to get much done. Today I woulda got more done on the boat but spent it at work. I'll go to the boat to change the oil and engine zinc on my Yanmar 2GM tomorrow. Tried to find some 600 ohm resistors at Radio Shack for my homemade ultra-bright LED anchor light but no luck, will havta order em. How much less power draw will that new LED anchor light have over a standard 12v light? I'd like to know also. Truckers are putting them all over their rigs and they are *bright*. One my last trip to Florida, while driving at night, I gave a trucker who was passing me the lights off/on routine to let him know it was safe to pull back over. He flashed all his lights in a "thanks" and damn near blinded me. Eisboch |
Gonna change the oil
wrote in message oups.com... When I drop by work on the way to the coast tomorrow, I'll get the specs from the LED package for current draw and calculate the power. I am using 6 of the LEDs so it oughta be fairly bright. If I remember right, it was less than 1/2 of a 12 watt bulb. I am speccing 1 watt resistors for it though (6 resistors in parallel each in series with an LED). Are the LEDs part of the parallel branches of the circuit? Meaning: 12v_________/\/\/\/\/\/\/\_________LED_________Ground 12v_________/\/\/\/\/\/\/\_________LED_________Ground 12v_________/\/\/\/\/\/\/\_________LED_________Ground 12v_________/\/\/\/\/\/\/\_________LED_________Ground 12v_________/\/\/\/\/\/\/\_________LED_________Ground 12v_________/\/\/\/\/\/\/\_________LED_________Ground or are they: 12v__________/\/\/\/\/\/\/\____________LED_____Ground 12v__________/\/\/\/\/\/\/\_____l______ LED_____Ground 12v__________/\/\/\/\/\/\/\_____l______ LED_____Ground 12v__________/\/\/\/\/\/\/\_____l______ LED_____Ground 12v__________/\/\/\/\/\/\/\_____l______ LED_____Ground 12v__________/\/\/\/\/\/\/\_____l______ LED_____Ground ??? Eisboch |
Gonna change the oil
First version, otherwise why use 6 resistors instead of one single
lower ohmage one of higher power. |
Gonna change the oil
On 29 Dec 2005 17:47:55 -0800, "
wrote: If I remember right, it was less than 1/2 of a 12 watt bulb. I am speccing 1 watt resistors for it though (6 resistors in parallel each in series with an LED). ========================================= How many LEDs in series would it take to use no resistors at all? Six 1 watt resistors per LED sounds like a lot of wasted power to me. |
Gonna change the oil
wrote in message ups.com... First version, otherwise why use 6 resistors instead of one single lower ohmage one of higher power. I was trying to roughly calculate the power requirements. You said 600 ohm resistors, correct? The voltage drop on the LED will be minimal when forward biased or "on", so each branch must be about .02 amps, times six equals .12 amps, so the power must be about 12v times .12 or about 1.4 watts. Probably a bit more when you factor in the LED drop, whatever it is. Significantly less than a regular light bulb! Eisboch |
Gonna change the oil
"Eisboch" wrote in message ... wrote in message ups.com... First version, otherwise why use 6 resistors instead of one single lower ohmage one of higher power. I was trying to roughly calculate the power requirements. You said 600 ohm resistors, correct? The voltage drop on the LED will be minimal when forward biased or "on", so each branch must be about .02 amps, times six equals .12 amps, so the power must be about 12v times .12 or about 1.4 watts. Probably a bit more when you factor in the LED drop, whatever it is. Significantly less than a regular light bulb! Eisboch In fact, the more I think about it, somethings wrong here. I must have misunderstood your hookup. Do you plan to use six, 600 ohm resistors in parallel for *each* of the LED segments? If so, the power consumed will go up big time. Or is it a single 600 ohm resistor per LED segment. If so, one watt resistors won't hack it. Eisboch |
Gonna change the oil
"Eisboch" wrote in message ... wrote in message ups.com... First version, otherwise why use 6 resistors instead of one single lower ohmage one of higher power. I was trying to roughly calculate the power requirements. You said 600 ohm resistors, correct? The voltage drop on the LED will be minimal when forward biased or "on", so each branch must be about .02 amps, times six equals .12 amps, so the power must be about 12v times .12 or about 1.4 watts. Probably a bit more when you factor in the LED drop, whatever it is. Significantly less than a regular light bulb! Eisboch Most LED's are in the 400mw range. |
Gonna change the oil
"Wayne.B" wrote in message ... On 29 Dec 2005 17:47:55 -0800, " wrote: If I remember right, it was less than 1/2 of a 12 watt bulb. I am speccing 1 watt resistors for it though (6 resistors in parallel each in series with an LED). ========================================= How many LEDs in series would it take to use no resistors at all? Six 1 watt resistors per LED sounds like a lot of wasted power to me. 1 watt resistor can dissipate 1 watt of power across it, does not mean there will be that much power. We always used 1/4w resisters. |
Gonna change the oil
"Bill McKee" wrote in message .net... "Eisboch" wrote in message ... wrote in message ups.com... First version, otherwise why use 6 resistors instead of one single lower ohmage one of higher power. I was trying to roughly calculate the power requirements. You said 600 ohm resistors, correct? The voltage drop on the LED will be minimal when forward biased or "on", so each branch must be about .02 amps, times six equals .12 amps, so the power must be about 12v times .12 or about 1.4 watts. Probably a bit more when you factor in the LED drop, whatever it is. Significantly less than a regular light bulb! Eisboch Most LED's are in the 400mw range. Does that include the new, high powered ones? The are being used on trucks for brake lights, turn signals and other places to replace bulbs. They are incredibly bright. Maybe the brightness is due to optics being used, like a Fresnel lens or something. Eisboch |
Gonna change the oil
"Bill McKee" wrote in message .net... "Eisboch" wrote in message ... wrote in message ups.com... First version, otherwise why use 6 resistors instead of one single lower ohmage one of higher power. I was trying to roughly calculate the power requirements. You said 600 ohm resistors, correct? The voltage drop on the LED will be minimal when forward biased or "on", so each branch must be about .02 amps, times six equals .12 amps, so the power must be about 12v times .12 or about 1.4 watts. Probably a bit more when you factor in the LED drop, whatever it is. Significantly less than a regular light bulb! Eisboch Most LED's are in the 400mw range. How about the standard 12v bulb used for anchor lights? |
Gonna change the oil
OK, my recollection from a web site about LED use said to figure a
voltage drop of 3.4 volts for the white ultrabrights leaving about a 9 volt drop for the resistor. At 600 ohms, this gives about .015 amp through each resistor and LED. Yes, the correct resistor wattage is less than 1/4 watt but I hate blowing resistorswhen odd things happen and space saving is not a consideration here. Radio Shack had nothing even as alrge as 1/4 watt less than 1000 ohms. |
Gonna change the oil
" JimH" wrote in message ... "Bill McKee" wrote in message .net... "Eisboch" wrote in message ... wrote in message ups.com... First version, otherwise why use 6 resistors instead of one single lower ohmage one of higher power. I was trying to roughly calculate the power requirements. You said 600 ohm resistors, correct? The voltage drop on the LED will be minimal when forward biased or "on", so each branch must be about .02 amps, times six equals .12 amps, so the power must be about 12v times .12 or about 1.4 watts. Probably a bit more when you factor in the LED drop, whatever it is. Significantly less than a regular light bulb! Eisboch Most LED's are in the 400mw range. How about the standard 12v bulb used for anchor lights? I don't know what their wattage rating typically is. My guess would be somewhere between 10 - 20 watts, given that they are required to be seen, what, 2 miles away at night? Eisboch |
Gonna change the oil
For the sake of comparison, a normal anchor light is 12 watts. These
LEDs are seriously bright, ordered em from Digi-Key. |
Gonna change the oil
wrote in message oups.com... OK, my recollection from a web site about LED use said to figure a voltage drop of 3.4 volts for the white ultrabrights leaving about a 9 volt drop for the resistor. At 600 ohms, this gives about .015 amp through each resistor and LED. Yes, the correct resistor wattage is less than 1/4 watt but I hate blowing resistorswhen odd things happen and space saving is not a consideration here. Radio Shack had nothing even as alrge as 1/4 watt less than 1000 ohms. That's what I really dislike about the "new" Radio Shack. I suspect once their inventory of discrete components are gone, you won't be able to buy *any* resistors, capacitors or anything there. Eisboch |
Gonna change the oil
I'll admit, half the stuff I try doesnt work but i suspect this will.
Anothetr thing I am trying is to wire my solar panel as a way to turn off the anchor light at night. I got the idea from a web site I saw so I lay no claim to it. They connect a NC relay across the solar panel. When it generates power, it powers the relay (30 mWatt) which turns off the anchor light. Of course I'll incorporate a switch to turn off the entire thing, relay incluided. Radio Shack did have the relay. |
Gonna change the oil
wrote in message oups.com... I'll admit, half the stuff I try doesnt work but i suspect this will. Anothetr thing I am trying is to wire my solar panel as a way to turn off the anchor light at night. I got the idea from a web site I saw so I lay no claim to it. They connect a NC relay across the solar panel. When it generates power, it powers the relay (30 mWatt) which turns off the anchor light. Of course I'll incorporate a switch to turn off the entire thing, relay incluided. Radio Shack did have the relay. You have a great attitude. People get smart not by always knowing what works, but rather what doesn't. You never know until you try. Eisboch |
Gonna change the oil
"Eisboch" wrote in message ... " JimH" wrote in message ... "Bill McKee" wrote in message .net... "Eisboch" wrote in message ... wrote in message ups.com... First version, otherwise why use 6 resistors instead of one single lower ohmage one of higher power. I was trying to roughly calculate the power requirements. You said 600 ohm resistors, correct? The voltage drop on the LED will be minimal when forward biased or "on", so each branch must be about .02 amps, times six equals .12 amps, so the power must be about 12v times .12 or about 1.4 watts. Probably a bit more when you factor in the LED drop, whatever it is. Significantly less than a regular light bulb! Eisboch Most LED's are in the 400mw range. How about the standard 12v bulb used for anchor lights? I don't know what their wattage rating typically is. My guess would be somewhere between 10 - 20 watts, given that they are required to be seen, what, 2 miles away at night? Eisboch What is the benefit for a boater on the hook overnight besides having a brighter anchor light? Is there a significant less draw on the house battery over a 10 hour period? |
Gonna change the oil
Less than half the draw on the house battery.
|
Gonna change the oil
" JimH" wrote in message ... "Eisboch" wrote in message ... " JimH" wrote in message ... "Bill McKee" wrote in message .net... "Eisboch" wrote in message ... wrote in message ups.com... First version, otherwise why use 6 resistors instead of one single lower ohmage one of higher power. I was trying to roughly calculate the power requirements. You said 600 ohm resistors, correct? The voltage drop on the LED will be minimal when forward biased or "on", so each branch must be about .02 amps, times six equals .12 amps, so the power must be about 12v times .12 or about 1.4 watts. Probably a bit more when you factor in the LED drop, whatever it is. Significantly less than a regular light bulb! Eisboch Most LED's are in the 400mw range. How about the standard 12v bulb used for anchor lights? I don't know what their wattage rating typically is. My guess would be somewhere between 10 - 20 watts, given that they are required to be seen, what, 2 miles away at night? Eisboch What is the benefit for a boater on the hook overnight besides having a brighter anchor light? Is there a significant less draw on the house battery over a 10 hour period? Yes. These lights may be purchased with all the dropping resistors built into the housing. The OP is a do-it-yourselfer, enjoying the challange of designing his own circuits. Eisboch |
Gonna change the oil
There is a commercially available LED anchor light that sells for about
$113 but for some strange reason I had to try to make it myself. The difference in cost is not significant when you consider what most of us get paid/hr and the time it will take me. In fact, I'll probably lose money so I am not sure why I am making it myself. |
Gonna change the oil
wrote in message oups.com... Less than half the draw on the house battery. Thanks. I take it this is not a cost effective thing for the casual night boater to do, unless a brighter light and more visibility is wanted. |
Gonna change the oil
" JimH" wrote in message ... wrote in message oups.com... Less than half the draw on the house battery. Thanks. I take it this is not a cost effective thing for the casual night boater to do, unless a brighter light and more visibility is wanted. Brighter, they are, and that's not a bad thing. They also have a long life when compared to a regular bulb. It would take a while to recover the initial cost compared to the cost of replacement bulbs however. Eisboch |
Gonna change the oil
If you have time on your hands, maybe it is cost effective. The LEDs
are about $2.00 each and the resistors cant be any more than $.50 each and the relay is $4.50 for a total cost of components of about $20.00. |
Gonna change the oil
wrote in message oups.com... If you have time on your hands, maybe it is cost effective. The LEDs are about $2.00 each and the resistors cant be any more than $.50 each and the relay is $4.50 for a total cost of components of about $20.00. I just checked a USCG approved LED anchor light. 3 watts at 12 volts. 2nm visibility. Over 100 bucks. Eisboch |
Gonna change the oil
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Gonna change the oil
"Eisboch" wrote in message ... "Bill McKee" wrote in message .net... "Eisboch" wrote in message ... wrote in message ups.com... First version, otherwise why use 6 resistors instead of one single lower ohmage one of higher power. I was trying to roughly calculate the power requirements. You said 600 ohm resistors, correct? The voltage drop on the LED will be minimal when forward biased or "on", so each branch must be about .02 amps, times six equals .12 amps, so the power must be about 12v times .12 or about 1.4 watts. Probably a bit more when you factor in the LED drop, whatever it is. Significantly less than a regular light bulb! Eisboch Most LED's are in the 400mw range. Does that include the new, high powered ones? The are being used on trucks for brake lights, turn signals and other places to replace bulbs. They are incredibly bright. Maybe the brightness is due to optics being used, like a Fresnel lens or something. Eisboch Maybe a little more, but not much. The trucks use them for the same reason I went to LED's on the boat trailer. Longevity. they do not have to waste time, explaining to the cops why the clearance lights are not all working. They are very voltage sensitive. to little voltage, not enough current and the LED is black, increase voltage to a point and they get brighter, increase more and they start getting dimmer, and too much voltage and they are bright for a few milliseconds, and the magic smoke is released. |
Gonna change the oil
wrote in message oups.com... If you have time on your hands, maybe it is cost effective. The LEDs are about $2.00 each and the resistors cant be any more than $.50 each and the relay is $4.50 for a total cost of components of about $20.00. There is a seller on EBAY from Asia, that sells the bright LED's for a decent price. I think the shipping is for 20 at a time. |
Gonna change the oil
wrote in message ... On Thu, 29 Dec 2005 22:15:47 -0500, "Eisboch" wrote: " JimH" wrote in message ... wrote in message oups.com... Less than half the draw on the house battery. Thanks. I take it this is not a cost effective thing for the casual night boater to do, unless a brighter light and more visibility is wanted. Brighter, they are, and that's not a bad thing. They also have a long life when compared to a regular bulb. It would take a while to recover the initial cost compared to the cost of replacement bulbs however. Eisboch When you are using a bunch of LEDs on a circuit you get every extra one in series for free. Why waste power through 6 resistors. At least go 3 and 3 starting with a resistor in the 100 ohm range. I bet they will drop more than 2v each so you probably can't do six in series. Even if they light you still want some resistance in there. There are replacement LED lights that plug into the standard socket. May have to do a google search for them. |
Gonna change the oil
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Gonna change the oil
"Harry Krause" wrote in message ... K. Smith wrote: As for anchor lights we have used them for about 3 yrs now, but we buy them. I wonder what that means in English? I think it means she buys used anchor lights. Eisboch |
Gonna change the oil
JimH,
I have a deep cycle gel battery, When I use my anchor light, it has never made it through the night without being completely discharged. Is this normal? " JimH" wrote in message ... "Eisboch" wrote in message ... " JimH" wrote in message ... "Bill McKee" wrote in message .net... "Eisboch" wrote in message ... wrote in message ups.com... First version, otherwise why use 6 resistors instead of one single lower ohmage one of higher power. I was trying to roughly calculate the power requirements. You said 600 ohm resistors, correct? The voltage drop on the LED will be minimal when forward biased or "on", so each branch must be about .02 amps, times six equals .12 amps, so the power must be about 12v times .12 or about 1.4 watts. Probably a bit more when you factor in the LED drop, whatever it is. Significantly less than a regular light bulb! Eisboch Most LED's are in the 400mw range. How about the standard 12v bulb used for anchor lights? I don't know what their wattage rating typically is. My guess would be somewhere between 10 - 20 watts, given that they are required to be seen, what, 2 miles away at night? Eisboch What is the benefit for a boater on the hook overnight besides having a brighter anchor light? Is there a significant less draw on the house battery over a 10 hour period? |
Gonna change the oil
"Reggie Smithers" wrote in message ... JimH, I have a deep cycle gel battery, When I use my anchor light, it has never made it through the night without being completely discharged. Is this normal? " JimH" wrote in message ... "Eisboch" wrote in message ... " JimH" wrote in message ... "Bill McKee" wrote in message .net... "Eisboch" wrote in message ... wrote in message ups.com... First version, otherwise why use 6 resistors instead of one single lower ohmage one of higher power. I was trying to roughly calculate the power requirements. You said 600 ohm resistors, correct? The voltage drop on the LED will be minimal when forward biased or "on", so each branch must be about .02 amps, times six equals .12 amps, so the power must be about 12v times .12 or about 1.4 watts. Probably a bit more when you factor in the LED drop, whatever it is. Significantly less than a regular light bulb! Eisboch Most LED's are in the 400mw range. How about the standard 12v bulb used for anchor lights? I don't know what their wattage rating typically is. My guess would be somewhere between 10 - 20 watts, given that they are required to be seen, what, 2 miles away at night? Eisboch What is the benefit for a boater on the hook overnight besides having a brighter anchor light? Is there a significant less draw on the house battery over a 10 hour period? I never had that problem. Something you can consider is a portable anchor light such as this one http://tinyurl.com/akeg7 |
Gonna change the oil
JimH,
This is exactly what I need, it uses one tenth the power of a 12 volt bulb. I saw that there were some all around LED lights to replace the 12 volt bulbs, but they were substantially more expensive, and only saved 1/2 the power. I forgot to mention that the Gel Deep Cycle battery also powered the refrigerator, so that is probably why it always died during the night. " JimH" wrote in message ... "Reggie Smithers" wrote in message ... JimH, I have a deep cycle gel battery, When I use my anchor light, it has never made it through the night without being completely discharged. Is this normal? " JimH" wrote in message ... "Eisboch" wrote in message ... " JimH" wrote in message ... "Bill McKee" wrote in message .net... "Eisboch" wrote in message ... wrote in message ups.com... First version, otherwise why use 6 resistors instead of one single lower ohmage one of higher power. I was trying to roughly calculate the power requirements. You said 600 ohm resistors, correct? The voltage drop on the LED will be minimal when forward biased or "on", so each branch must be about .02 amps, times six equals .12 amps, so the power must be about 12v times .12 or about 1.4 watts. Probably a bit more when you factor in the LED drop, whatever it is. Significantly less than a regular light bulb! Eisboch Most LED's are in the 400mw range. How about the standard 12v bulb used for anchor lights? I don't know what their wattage rating typically is. My guess would be somewhere between 10 - 20 watts, given that they are required to be seen, what, 2 miles away at night? Eisboch What is the benefit for a boater on the hook overnight besides having a brighter anchor light? Is there a significant less draw on the house battery over a 10 hour period? I never had that problem. Something you can consider is a portable anchor light such as this one http://tinyurl.com/akeg7 |
Gonna change the oil
I'll bet it was the bulb in the refrigerator that did it!
On Fri, 30 Dec 2005 10:37:53 -0500, "Reggie Smithers" wrote: JimH, This is exactly what I need, it uses one tenth the power of a 12 volt bulb. I saw that there were some all around LED lights to replace the 12 volt bulbs, but they were substantially more expensive, and only saved 1/2 the power. I forgot to mention that the Gel Deep Cycle battery also powered the refrigerator, so that is probably why it always died during the night. " JimH" wrote in message ... "Reggie Smithers" wrote in message ... JimH, I have a deep cycle gel battery, When I use my anchor light, it has never made it through the night without being completely discharged. Is this normal? " JimH" wrote in message ... "Eisboch" wrote in message ... " JimH" wrote in message ... "Bill McKee" wrote in message .net... "Eisboch" wrote in message ... wrote in message ups.com... First version, otherwise why use 6 resistors instead of one single lower ohmage one of higher power. I was trying to roughly calculate the power requirements. You said 600 ohm resistors, correct? The voltage drop on the LED will be minimal when forward biased or "on", so each branch must be about .02 amps, times six equals .12 amps, so the power must be about 12v times .12 or about 1.4 watts. Probably a bit more when you factor in the LED drop, whatever it is. Significantly less than a regular light bulb! Eisboch Most LED's are in the 400mw range. How about the standard 12v bulb used for anchor lights? I don't know what their wattage rating typically is. My guess would be somewhere between 10 - 20 watts, given that they are required to be seen, what, 2 miles away at night? Eisboch What is the benefit for a boater on the hook overnight besides having a brighter anchor light? Is there a significant less draw on the house battery over a 10 hour period? I never had that problem. Something you can consider is a portable anchor light such as this one http://tinyurl.com/akeg7 -- John H. "Divide each difficulty into as many parts as is feasible and necessary to resolve it." Rene Descartes |
Gonna change the oil
JohnH,
You might be correct, we keep the refrigerator door open so we could have a nightlight on. ; ) "JohnH" wrote in message ... I'll bet it was the bulb in the refrigerator that did it! On Fri, 30 Dec 2005 10:37:53 -0500, "Reggie Smithers" wrote: JimH, This is exactly what I need, it uses one tenth the power of a 12 volt bulb. I saw that there were some all around LED lights to replace the 12 volt bulbs, but they were substantially more expensive, and only saved 1/2 the power. I forgot to mention that the Gel Deep Cycle battery also powered the refrigerator, so that is probably why it always died during the night. " JimH" wrote in message ... "Reggie Smithers" wrote in message ... JimH, I have a deep cycle gel battery, When I use my anchor light, it has never made it through the night without being completely discharged. Is this normal? " JimH" wrote in message ... "Eisboch" wrote in message ... " JimH" wrote in message ... "Bill McKee" wrote in message .net... "Eisboch" wrote in message ... wrote in message ups.com... First version, otherwise why use 6 resistors instead of one single lower ohmage one of higher power. I was trying to roughly calculate the power requirements. You said 600 ohm resistors, correct? The voltage drop on the LED will be minimal when forward biased or "on", so each branch must be about .02 amps, times six equals .12 amps, so the power must be about 12v times .12 or about 1.4 watts. Probably a bit more when you factor in the LED drop, whatever it is. Significantly less than a regular light bulb! Eisboch Most LED's are in the 400mw range. How about the standard 12v bulb used for anchor lights? I don't know what their wattage rating typically is. My guess would be somewhere between 10 - 20 watts, given that they are required to be seen, what, 2 miles away at night? Eisboch What is the benefit for a boater on the hook overnight besides having a brighter anchor light? Is there a significant less draw on the house battery over a 10 hour period? I never had that problem. Something you can consider is a portable anchor light such as this one http://tinyurl.com/akeg7 -- John H. "Divide each difficulty into as many parts as is feasible and necessary to resolve it." Rene Descartes |
Gonna change the oil
"Reggie Smithers" wrote in message . .. JohnH, You might be correct, we keep the refrigerator door open so we could have a nightlight on. ; ) "JohnH" wrote in message ... I'll bet it was the bulb in the refrigerator that did it! On Fri, 30 Dec 2005 10:37:53 -0500, "Reggie Smithers" wrote: JimH, This is exactly what I need, it uses one tenth the power of a 12 volt bulb. I saw that there were some all around LED lights to replace the 12 volt bulbs, but they were substantially more expensive, and only saved 1/2 the power. I forgot to mention that the Gel Deep Cycle battery also powered the refrigerator, so that is probably why it always died during the night. " JimH" wrote in message ... "Reggie Smithers" wrote in message ... JimH, I have a deep cycle gel battery, When I use my anchor light, it has never made it through the night without being completely discharged. Is this normal? " JimH" wrote in message ... "Eisboch" wrote in message ... " JimH" wrote in message ... "Bill McKee" wrote in message .net... "Eisboch" wrote in message ... wrote in message ups.com... First version, otherwise why use 6 resistors instead of one single lower ohmage one of higher power. I was trying to roughly calculate the power requirements. You said 600 ohm resistors, correct? The voltage drop on the LED will be minimal when forward biased or "on", so each branch must be about .02 amps, times six equals .12 amps, so the power must be about 12v times .12 or about 1.4 watts. Probably a bit more when you factor in the LED drop, whatever it is. Significantly less than a regular light bulb! Eisboch Most LED's are in the 400mw range. How about the standard 12v bulb used for anchor lights? I don't know what their wattage rating typically is. My guess would be somewhere between 10 - 20 watts, given that they are required to be seen, what, 2 miles away at night? Eisboch What is the benefit for a boater on the hook overnight besides having a brighter anchor light? Is there a significant less draw on the house battery over a 10 hour period? I never had that problem. Something you can consider is a portable anchor light such as this one http://tinyurl.com/akeg7 -- John H. "Divide each difficulty into as many parts as is feasible and necessary to resolve it." Rene Descartes It also keeps the cabin cool. ;-) |
Gonna change the oil
wrote: With few people at work, its hard to get much done. Today I woulda got more done on the boat but spent it at work. I'll go to the boat to change the oil and engine zinc on my Yanmar 2GM tomorrow. Tried to find some 600 ohm resistors at Radio Shack for my homemade ultra-bright LED anchor light but no luck, will havta order em. For those not inclined to make their own LED lights, here's a link to a site with additional information about one particular brand: http://www.mmboatyard.com/New_From_MMBoatyard.html The one disadvantage to these lights, so far, is their cost. The offset could be that for any lights (like a masthead light) that some boaters might currently be paying somebody to replace the price of installing one LED light that should last 50,000 hours (will never wear out in typical pleasure boat service) will be less than sending a worker up the mast a second or third time during the ownership of the vessel. They are very bright, and far more bulletproof than a lightbulb. Lopo also makes interior cabin lights. |
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