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Unread 02-09-2010, 10:35 PM   #1
Rope
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L.E.D Diode mcd power for turn/brake

SO I've been doing lots off research lately and have learned a little about l.e.d lighting. My question is that since I am making all turn signals and eventually tail and the OEM 3rd brake light replacement bulbs
1). I plan on using (6) 5mm white diodes rated at
- FW 25mA
- FW supply 3.3v
- intensity 7000mcd at a 30degree view
2) Would this be more than bright enough for the amber OE lenses of the TJ
or do you think that (4) would suffice



these calculations are from this site which is sweet since you can put in how many diodes and what volt application its for: LED series parallel array wizard
this is for (4) diodes
* each 220 ohm resistor dissipates 137.5 mW
* the wizard thinks 1/4W resistors are fine for your application Help
* together, all resistors dissipate 275 mW
* together, the diodes dissipate 330 mW
* total power dissipated by the array is 605 mW
* the array draws current of 50 mA from the source.
or should i do the (6) diode setup for each turn signal up front

-and of course I would replace my turn signal module with a l.e.d capable one.

As for my brakes those will come later I want everyone's opinion first, and must at least know something about l.e.d lighting please

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Unread 02-10-2010, 07:10 AM   #2
SirGCal
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I haven't bothered to run the math on this since so many places out there sell plug-in LED systems anymore, it's not worth my time to build my own.

But, you're biggest problem is going to be brightness. Most LEDs are hard to see in the daytime. Legality might also be an issue, I'd have to check.
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Unread 02-10-2010, 08:15 AM   #3
CO64CJ5
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I question using white LED's behind an amber lens. A white LED puts out a more-or-less full spectrum, then you are filtering out all but the amber. If you use an amber LED instead, it's only putting out amber light, most of which will pass through the lens.

I don't know how you can calculate this unless you can get the spectral specs for the lens. I think it would be much simpler to just try it with white and amber LED's.

As for your actual question, I'd put in as many LED's as I could. I don't think six LED's would give you very good coverage at 30°, and I don't know how well the lens would work with multiple narrow-angle sources -- that's another experiment.

I have not looked at the wizard you linked, so I don't know how you're proposing to wire these. Given your specs, I'd put 3 LED's in series, which would take something like a 100 ohm resistor.
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Unread 02-10-2010, 05:54 PM   #4
Rope
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Well after hrs of research I may have found a solution to high intensity lighting for a fraction of the cost to those plug and play autoparts bulbs...I ll be ordering the parts next week and let whoever is interested know the outcome once I build the boards
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