LED Question

[Wyoming]

I'm working on a small detail mod, replacing the standard power and HD LEDs on my Coolermaster Ammo 533.

Where can I buy very bright white LEDs and blue LEDs with a softer glow?

Does anyone know what sort of LEDs are used by Coolermaster in the case I have and what voltage is supplied to the power and HD LEDs by the motherboard? I'm trying to work out if I'll need any resistors to alter the voltage supplied.

[TheAnimus]

Softer glow? Less lumination you mean?

I'd just use a simple ceremic preset pot.
Electronic components, electronic equipment and electrical components from Rapid

you won't get any that are log and cheap (Which is a shame, as human's percive light log) but you will get a multiturn. This will let you calibrate them to your liking.

The ATX spec i don't think mentions the voltage, but sure as eggs are eggs its going to be a 5V. Personally i'd always limit the current with a resistor, even thou i doubt its needed, i'd sling in a 220ohm or similar just to stop the unlikely from ever happening. (220ohm V=IR, 5V rail, drop 1.7v-2.5v, will be about right.).