Dave wrote:
The kind Jon posited in his hypothetical when he said: "They have a
chemical luminescent light attached to each of them, as required by the
regs."

Ah so. My mistake, that's what happens when you try to
answer a question after reading it 34 bad puns ago.

Battery powered strobes for lifejackets are definitely
approved, I have two and they have both been nodded at
approvingly by the USCG (even though they are British made).

DSK