Thanks for the info. Small (important?) corrections and additional
info follows:

Seven bulbs in paralled and are 25 watts, not 40 watts. Resulting in
a total of 175 watts on a 300 watt transformer. However, one bulb
still burns at regular brightness.

The copper wire is 12 guage and stranded. About 30 feet long.

I though the low voltage yard lights were transformed to 12 volt DC
not 12 volt AC. Is that the issue?

Tom

"Tom Best" wrote in message
om...

I though the low voltage yard lights were transformed to 12 volt DC
not 12 volt AC. Is that the issue?

The light bulb would not care if it got 12 VDC or 12VAC.

It might help if you provided more detail on the "DC Converter".

Why are you using a DC converter instead of a simple AC transformer?

You said it was made for this so one would assume the voltage is correct,
but you should measure it anyway. Have the lights been on 24 hours a day, or
just a few hours each evening?

Light bulbs are rated in number of hours they can be expected to last. Some
light bulbs will last thousands of hours. Others, like a projector bulb for
example, may last only tens of hours.

Heat, shock and vibration are reasons for premature bulb failure. Some
bulbs are not rated to operate in an "upside down" position, as it will
cause the base to overheat. Make sure that the bulb is not being used in an
inappropriate application.

Perhaps if you told us exactly what bulbs you were using it would help. You
said they were in a screw base, are these the 12volt bulbs that are often
used in RVs or boats?

Rod McInnis