so your saying every 3 leds put a resistor?The LEDs would most likely be wired in strings of three, with a current limiter; either an active semiconductor device, or more likely a simple resistor.
60/3 = 20 strings
400mA / 20 = 20mA, which is a typical LED current.
Blue LEDs typically have a Vf of between 3.2v to 3.8v.
3.4v x 3 = 10.2v total.
So, the resistor would have to drop 1.8v across itself allowing 20mA to pass.
1.8v/20mA = 90 Ohms.
If each led needs 20mA to work then you can put up to 1000 leds! However, if you use Sgt's idea you can put up to 3000 leds with the same power consumption. Its a compromise between with what I mentioned before.I think ill go with a resistor every LED. How many do you think i can put on with a 12v dc car battery?
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