I don’t think a capacitor will help much unless you put a diode ahead of it.
Or a low dropout regulator.
From: Bill Prince
Sent: Sunday, January 25, 2015 12:16 PM
To: af@afmug.com
Subject: Re: [AFMUG] OT: Vehicle Lighting
Add a capacitor locally to smooth out the alternator ripple.
bp
<part15sbs{at}gmail{dot}com>
On 1/24/2015 2:46 PM, Chris Fabien wrote:
I found some LED under cabinet puck lighting at home depot that was 12v to
the pucks. I wired them up to the van power directly. Only issue is they show
alternator flicker. Have tried adding stiffening capacitance without much
result. Works but slightly annoying. The pucks were light enough to mount with
double sided adhesive foam tape.
On Jan 24, 2015 2:58 PM, "Bill Prince" <part15...@gmail.com> wrote:
Maybe look at the voltage drop across each LED. Should be about 0.7 volts.
So there should be "about " 20 to be forward biased per 14 volts in a typical
vehicle. Will probably need some resistor for each section to limit current.
bp
<part15sbs{at}gmail{dot}com>
On 1/24/2015 11:06 AM, Nate Burke wrote:
The bulb comes apart easily. They are all in series, hence the high
voltage. Maybe I will try scraping off some traces and see what happens.
On 1/24/2015 12:39 PM, Bill Prince wrote:
Any way to get inside? The LEDs probably run on something like 5 volts
or less, and the 68V is probably because they have a bunch in series.
if you could get inside you might be able to MacGiver something to work
on straight 12V.
bp
<part15sbs{at}gmail{dot}com>
On 1/24/2015 10:17 AM, Nate Burke wrote:
I'm looking to do some interior lighting in a work van. I had the
bright idea of using the light strips out of a 4' LED fluorescent replacement
tube, 1600 lumen, 18w ($12 on ebay). I think it will work perfect since it will
be nice bright light over a 4' area, and is ultra thin, and can just be glued
to the ceiling.
The problem I'm having is the power for it. When I pulled one of
them apart, the LED Strip is running at 68.2vdc @0.2A. What's the best way to
adapt the vehicle 12v up to the 68v for the LED's? Should I just put in an
inverter and run them at 120vac as they were designed, or try to find a DC-DC
12v-70v converter? I tried running them at 50v from a POE Injector, and they
are just barely lit. I looked at LED Strips made for 12v, but they are very
low brightness. What I was finding were 15' reels, but only 350 total lumen.
These would be great
http://www.americanvan.com/van-and-truck-accessories/interior-lighting/premium-led-cargo-lights-for-your-van.html
but, I'm not sure why they're 2.5" deep. Seems like they'd be
accidentally hit/broken when mounted to the ceiling, not to mention $100/fixture
Any other Ideas I'm missing?
Nate
