Ok, plan is to use 5x of these, All five using XHP70.2 4500K LEDs. I am not concerned with mounting or modding the lights. My main obstacle at this point is how in the world do I put 5x XHPs on a switch circuit in a vehicle??? It would be really awesome to be able to control them in such a way to run them at a lower current as DRL’s but it’s not entirely necessary. Obviously I plan on housing the driver circuitry externally in an aluminum hobby box of some sort.
Any ideas, please chime in!
*Car has 2x optima yellow tops, with a 190A alternator. I don’t think ‘juice’ will be an issue!
Yeah, I assumed a relay setup at the very least. I am more so asking about LED driver circuitry. Would I need 5x separate FET drivers? Also would the cars output voltage of 13.8-14v be ok for a FET setup?
You can use a FET as a switch. It basically works like a relay. That’s what it is doing on the driver.
I thought you main concern was how your going to switch them in a car.
"I have used these in a auto.":https://www.ebay.com/itm/10pcs-Mini360-3A-DC-Voltage-Step-Down-Power-Converter-Buck-Module-3-3V-5V-9V-12V/132416658988?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649 There adjustable (Trimpot) so that might have advantage to your setup just encase the heat sink isn't big enough you could reduce the current. You might have to use one and test it to see how hot it gets. If you search around there is several variations of this converter.
As for the switch itself you could use a switch like this, and wire 2 lights to low and all 5 to high putting a diode in line with the low 2 wire so that the current can only flow one way when switched to low. Or you could use a on off switch and another switch to control low (2) and high (all 5), using the diode again.
Ok, how much current for 6x XHP70.2 in a parallel would be safe ideal. They would be 6v LEDs. Not sure if I can supply enough amperage, maybe I’ll just use SST40’s instead? Or 4x XHPs…
That gives you a idea for one, multiply that by ever how many 70.2's your going to use. At 3 amps that's close to 3000 lumens per led.
Power in = power out
12v@1.5amps in = 6v@3amps out.
18watts = 18 watts
Thats how a buck converter works, so with 6 6v leds at 3 amps each the 12v battery output is 9 amps or 108 watts or 18000 lumens. Wow!
There is other losses in the driver, switches and wires which arent accounted for above, and a 12v battery will measure above that, with the engine running at or closer to 14v, but this should be a close estimate.
Goodmorning all,
I just wanted to let you know that I have all most completed a LED light bar using 10 XHP LEDs,
6 x XHP70s and 4 x XHP50s.
So far it’s cost a little more than I’d expected but I’m very happy with the results for now :smiling_imp:
Each led is driven buy its own independent driver, I was originally going to use just 1 driver for them all but by using a driver for each LED I feel it makes it more reliable in that if 1 fails there will still be light…
