22 Jul
2016
22 Jul
'16
10:39 a.m.
From: jim stephens: Friday, July 22, 2016 12:46 AM
On 7/22/2016 12:25 AM, Vincent Slyngstad wrote:
Those chookfest bulbs are doing just what I'd expect from 12V bulbs
in a 28V circuit -- way too bright, and then a drastically shortened
lifespan. (The right bulb can last for years; the wrong one for
minutes.)
I'm not a big fan of the surgery involved in LED conversion, though
I understand why folks do it. Particularly if they, like Emil, have used
the wrong bulbs and found themselves replacing them all the time.
Somewhere, I have Oshino's write-up about bulb rated voltage and
bulb operating voltage, but I do remember the lifespan varies as
some power of the ratio, and it makes a huge difference. (There
are also formulae for derating brightness, etc.)
Vince
I mentioned
http://www.foxdata.com/blog/tag/nova-312/ to you earlier,
which suggested the 28V bulbs. I also found
http://www.chookfest.net/nova3/ledmod.html
which makes it clear that the voltage is likely a fair bit over 12V.
Thanks for the tips. I see that the foxdata site lamps don't appear
quite as bright as the chookfest ones, which is interesting. I'm
thinking now if I do anything it will be the LED route, so will evaluate
that, as I agree opening the thing back up will suck.