LED Mountain Bike Light Answered
I'm designing a home made LED mountain bike light. I Intend to use three CREE XPG 3UP stars which have three individual cree XPG LEDs mounted in series on a MCPCB star shaped board. Each individual LED when driven at 1500mA (the intended max current) will have a forward voltage of 3.5V. Therefore each 3UP MCPCB star will have a forward voltage of 10.5V when driven at 1500mA.
If I wire the three MCPCB's in parallel the current drawn from the battery will be 4500mA - correct? I was planning to buy an 11.1V / 6000mAh rechargable lithium-ion battery pack.
The battery pack will be connected to the LED's via a b2Flex LED driver that limits the max current to 1500mA but can be set to run at 350mA, 700mA, 1000mA and 1500mA max by programming the b2Flex driver. The light will probably be set to max current for short periods of riding but spend most time at 1000mA.
Does anyone see any problems with the slight voltage overdrive (i.e 11.1V from battery vs. 10.5V that he LED's will theoretically require)
I'd really appreciate any feedback on this.