LED tail light conversion

hmm.... i found a way not to hyper blink. It's called a load equalizer.

I'll think about it. What would you suggest?

ok, ill give you a way to draw the same current using 30 leds...

Use 1 resistor per led, each resistor led branch will draw around 25mA, so 30 will draw 0.75A

since a 21 watt bulb draws 1.75A we are short an amp, so to draw 1 A...

we could put a single resistor in parallel will all the resistor and leds, but that would mean we would need a 12 ohm resistor, further more it would need to be able to handle 12 Watts, quite a bit

to use smaller resistors you could put a bunch in parallel, I will assume you are using 1/2 watt resistors....

since P = V(I) and they are in parallel with 12V (assuming the lowest ~12V), V = 12, P= .5...

I = (0.5) / (12) = 42mA, therefore maximum these resistors can only handle 42mA, we will assume 40mA

so the resistors we need will be 1/2 watt, and must draw 40mA each, since we need to draw 1A we will need..

1A / 40mA = 25 quite a bit of resistors...

now to find the resistance value needed, V = I * R, R = V / I

therefore R = 12 / 40mA = 300, so you will need 25, 300 ohm resistors, you can check since the parallel resistance will be 300 / 12 = 12 ohm, so together it is 12ohm and each resistor will be burning off 0.48 Watts...

If you use 1W resistors you can use fewer (12 @ 150 ohms)

hope that helped...

sorry it was confusing, i am saying hook up the leds with a single 470 ohm resistor. Then take 25, 300 ohm resistors and solder them all in parallel with the leds/resistors... not elegant and a waste of power but hey it will draw as much as the incandecent...

I rather do it the most efficient way, and buy the load equalizer. So how will i use the least amount of energy for say..... 80 led's (each tail).

I doubt a load equilizer is more efficient, in fact it most likely is just a resistor like a 20 ohm, 10 watt. Problem is that thermal flashers work off heat produced from current draw, there are not that many ways to draw current without using power...

least amount of energy for 80 leds using the 3 per row would be 25mA * (80 / 3) = .67A

most current for 80 leds using single resistor and led: 25mA * 80 = 2A... too much