Connecting up a bunch of 1W LEDs Answered
Yet another LED question I'm afraid....
I've have a bunch of 30 cheap 1W LEDs from eBay and plan to use them in my kitchen for under-cabinet lighting. Forward voltage on the LEDs is 3-3.5V, max current 300mA.
I'm trying to figure out how best to power them. I have an old laptop power supply that provides 12V and up to 3A - that would give me up to 36W, enough to power the 30 x 1W LEDs. If I created multiple rings of 4 LEDs in series (giving a 3V drop across each), then connected each of these rings in parallel would that work? Or should I say, would that be a good way of doing things?
When dealing with much lower power LEDs (the typical 30mA or so type), I would usually put a resistor in front of each, but it seems that in the case of 1W LEDs I could end up losing a lot of energy across a resistor (and fry it in the process).