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5v light question

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NoBonus:
Okay, I still have not wired up a LED light system to my 5v output on my KeyWhiz Eco.  Here is my question.  I only want to light a translucent blue trackball and want the simplest and cheapest option available.... can I use a 6v flashlight bulb? or will that be too dim?  Is it a must to have a blue light? or will white light do?

TOK:
A standard flashlight bulb will make a lot of heat. If you want to go with 12v LED's, they're readily available at auto parts stores. I got a 3 pack for under 5 bucks and wired them right off a 12v lead on my computers power supply. I put all 3 in a piece of cardboard under the trackball, and they light it up very bright.

NoBonus:
I just want to run the light off of the 5v supplied by the keyboard cable, not directly from the computer's power-supply (thus the 12v option is out).   Now when you say a lot of heat, how much heat are we talking?

Popcorrin:
I don't think you would want to drive a flashlight bulb from your keywhiz.  It would draw too much current.  Instead I would use an led, preferabbly a superbright, and either blue or white should be fine.

NoBonus:
so a LED is the best option, but where should I attain one and what resistor to pick?  I need a little help... 

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