XPG light bar question.

Hi, i have seen this XPG lightbar on aliexpress with the following general specs.

30 x 5w XPG’s producing 9000 lumens(not the 12000 lumens in the main header)

http://www.aliexpress.com/store/product/5w-CREE-XP-G-single-row-led-light-bar-31-5inch-150w-power-12000lm-IP68/103560_575579496.html

so 30 pcs of 5w XPG’s produce a total of 150w / 12v (car’s power supply) = 12.5 amps

12.5amps / 30 pcs of XPG’s = 0.41amps per xpg?

did i get my calculations wrong somewhere? as i have read xpg’s can be driven 1.5amps.

just need some expert’s analysis on this as i want to know if this light bar is really putting out 9000 lumens or not.

thanks for any help.

:slight_smile:

The led's vf is around 3 not 12. So it would be 150w/3 volts=50 amps/30 leds=1.66 amps per led. Naturally this doesn't mean anything because they say the LEDs are 5 watts but they do not say they drive them to a full 5 watts.

oops i meant that the 12v is the car’s battery voltage.

so if it’s 1.66 amps per led thats approx +400 lumens per led?
400 x 30 leds = 12000 lumens ? the main heder says 12000lumens nut the detailed description says only 9k
of course these are chinese lumens hence my desire to really know whats the true output.

btw thanks for the reply.

Well, not really. The problem is they say the LED is a 5w led. They do not say that they drive it to a full 5 watts. Even if it was driven to a full 5 watts then 9000 lumens is a better estimate because the lenses block a large amount of the light.

I'm not sure why you're figuring out how much it draws from the cars battery unless you want to figure out runtime.

If the driver is 100% efficient then 150W /30 = 5W = ~3.3V x 1.5A = a fully driven led and the claim would be reasonable. This is not likely but at least they aren’t claiming more than is even theoretically possible. Should be a very bright ( and hot) light. I don’t see much in the way of fins for cooling that much heat. Can’t really predict output due to lack of driver specs. I notice they demonstrate it mounted on a tractor. A lot of money for guesswork.

ok. your inputs are noted and appreciated. just wanted some confirmation from the more informed if the 9k lumen output
is realistic. im still looking for a CC led automotive driver to pair with this light. i was in contact with a driver maker at CPF
but the sites kaput at the moment.

looked at some light bars from visionx and rigid but those are just way off the budget.

bigtoy302 is doing a xm-l bar but i think its still not available for the market.

One thing you could do is use pilotptk's triple xm-l module. They are fully driven XM-Ls with custom modes.