I found this article on the web and wanted to make sure I was reading it right, I will be buying 225 LED's that run 2.3v@20mA
I want to connect as many as I can together and use one resistor per grouping. I will be using a 12volt switchable wall transformer rated at 500mA.
From my calculations I can connect 5 LEDs with one 100ohm resistor? But it seems the power supply should be able to handle a lot more than just 5 leds, what am I missing? Heres the example I found. I will need to connect 200 LED's and try to run them off as few transformers as possible, is there something else i could use to get my current up without having to buy a 4amp (200 x 20mA) transformer?
A red, a yellow and a green LED in series need a supply voltage of at least 3