Remote Living > Lighting

My 12vdc LED Lights

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Tritium:
Damon,
You have e-mail.
Thurmond

DamonHD:
Ta!
Damon

oztules:
Woof,

I use it on say 7 strings at a time.... but use it not quite as Commanda wanted.
I wire up the strings for about the expected voltage with the usual dropping resistor you would use normally... but then use the commanda circuit in series with say 7 strings, and set if for the maximum current i would want them to see as a group. This way, if the voltage rises, then the load resistors don't see it.
That flounder light I mention below, has resistors to run it naturally at 18v for each string..... but if the bloke I built it for charges the battery up hard, it could see 22v.... which means to design it safely, I would have to derate the thing at 18v.... just to protect from high SOC conditions.
Using commandas circuit, I can limit the current to say 140ma per 7 strings (nominally 20ma per string), and overvoltage up to 40v or more makes no difference. By using the resistor value I would have used without the limiter, it allows load levelling between strings anyway.
So if you want to push them hard over a SOC type of range, it is very very good as the voltage can go all over the place, but the current stays the same for the bundle..... I embed them into the epoxy with the leds.... can't post a pic... dammit.
..........oztules

hysteresis:
Jolly good Woof on the color coordination. Have you considered putting yellow and green into the mix for more wider spectrum balance also?
I've run these HF CF bulbs in a conversion van for 4 yrs. with 2 deep cycle marine and A 1000A cranking battery in parallel without the internal HF reg. The E never exceeds 14.5V even in the strongest sun on three panels.
These LED units would be ideal in motor homes instead of the CF in the shells.
hys

DamonHD:

--- Quote from: Tritium on December 28, 2009, 10:39:01 AM ---Damon,<p>
You have e-mail.<p>
Thurmond

--- End quote ---

Just to note, c/o of Thurmond, I've been over a decade with a night-light based on an LED that he sent me!

https://www.earth.org.uk/LED-homebrew-nightlight.html

This was originally put together to help our daughter find her way to our toilet.  Soon she will be an adult old enough to leave home entirely...

Rgds

Damon

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