need a help ... i have 10 white bright led lights
and a battery of 6v 4.5ah (cycle use :7.25~7.45v (25 degree Centigrade ))
(initial current :less than 1.2a)
standby use :6.8~6.9v (25 degree Centigrade))


the leds are glowing fine with 3.5 v battery ....
but i have 6v 4.5ah battery
so if i connect the leds in parallel ....
which resistor should i use in each led to glow fine

i used 1 k resistor (as directed by a frnd) in each led but the light is too low (very dim )

 

I would use a 330 Ohm or 470 Ohm resistor on a 6V supply, what is the current for one led ?

 

FWIW, the guys selling cheap LEDs on e-bay often include 470Ω resistors with the intention that it's for a 12V system, giving up to 20mA or so. Personally I would shoot for a lower current (10-15mA is fine) and thus a larger value resistor as recommended by Dave.