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i knew i was using 12V but couldnt get the 4 in a series working correctly with the resistors i had. so i thought i would try running the 2 in pairs in parallel on the 5V to test and that works fine...

i won the war, though i had to change my plans very slightly.
I worked out that i still couldnt get them running with a 100R or a 68R so alas i got annoyed then realised something really stupid that...

that is precisely why we use resistors.
i wouldnt be shocked if you popped it.

i would recommend looking at the above LED Guide to see what you need :)

thanks for your help :) really appreciated.

I bought 8 Red LEDs and 2 Ultra Bright Blue LEDs.
The thing i read in the specs were that the 8 reds are 2.5v and max current of 30mA with an optimal...

it coverts a certain amount of energy in to heat and thus reduces the energy in the circuit.

thanks for the heads up, i did some testing last night with a string and had a few problems, but have started to get round it seems the numbers on the data sheet for the LEDs were wrong so its going...

Thanks for the fast response :)

sorry i forgot to add the 12v part of my idea :P i was going to run it from a molex in my case :) maybe to a PCB and then with a switch and whatnot but wasnt sure....

Ive already read a few tutorials and to be honest im unsure where to go at current as i was tempted to run 2 series of 4 in parallel, though im not sure.

I think running them in parrallel would be...

Thanks for the response,
I've already read that tutorial, i just wondered why people had done it differently i personally would have thought it would have gone at the front before the diodes.

I...

nice guide thanks for that going to go play later as long as i find the LED's i want :)

just a question though, why put the resistor at the negative end? a few of the wiring diagrams put it at the...