[Nerys]

Need some expert LED advice. I am getting some yellow red and white LED's to replace all my navigation lights on my metro with LED's

Found a great deal on some nice 1watt LED's

anyway I have to wire them. I need 3.5 v for the white ones and 2 to 2.5 volts for the yellow and red led's

anyway I found ledcalculator.net

the result I got was this

* You will need 1 x 30 ohm 5 watt resistor.
* The 30 ohm resistor is color coded: Orange, Black, Black, Gold.
* Each 30 ohm resistor consumes 4800 milliwatt.
* Total power consumed by the resistors is 4800 milliwatt.
* Total power consumed by the LEDs is 800 milliwatt.
* Total power consumed by the circuit is 5600 milliwatt.
* Total current drawn by the circuit is 400 milliampere.
* The resistor values are calculated based on the common ±5% tolerance resistors.
* Make sure to wire the LEDs in the correct direction as shown below.
* Always leave some space for the resistors to breathe. They might get hot.

am I reading this right? I am going to be dumping 5 watts into a resistor? if that is true there is no real point to going led since with 5 watts going into the resistor and 1 watt going into the led thats not much lower than just using the incan.

am I reading that wrong? if not how can I get the correct voltage and current without dumping so much power into the control circuitry?

I found some 2v and 3.3v voltage zener diodes. are they what I think they are? wire one into 13.8v car power and it will change it to 2.0 and 3.3 v ? do they consume a lot of power? DO they work like I think they do?

any help would be greatly appreciated!