Newbie LED/Power/Brightness question

[arthur2005]

Hello,

Great forum! I have a question I hope someone can answer. I'm making something for my employer, it's an LED lighting system consisting of three white LED's powered by battery. The LED's have to be as bright as possible and last as long as possible from a 3 volt battery power supply. My question is, which battery would you choose to power these LED's. Either a lithium or 2 1.5 volt AA batteries? Would there be any difference?

Also what LED would be the best choice? I need it to be as bright as possible and consume the lowest amount of power possible.


Thanks for any help...

Art

 

[tjalps]

For white LED's you can chose NICHIA or OSRAM. You'll have to respect the limitations betwen brightness and batery life time. The best to make some tests to define minimum brightness and then go to battery selection.

Regards!

 

[polarized]

Hi,


Every battery should have a data sheet where the battery capacity is specified. So, you just choose the higher capacity type if the physical size is not the problem.

 

[rkodaira]

Check the forward voltages of the white leds, probably they have a forward voltage higher than 3V (I think around 3.5 V) and you will need a voltage converter (DC-DC) to get a voltage suitable to turn the leds on.

 

[jjohn]

NiMh, NiCd will do...
Better intensity may be obtained if pulsed high voltge is applied..

 

[yousafzai]

Try any high candela led because it will give more light by consuming less power..

 

[ivar4ever]

u can chose ultra bright white LED, of any manufacturer.
it will give high intense light and can be operated through a 3v battery