Lot's of good feedback!

Here's my two bits. First of all, I can recall the day when computers used to have tons of flashing lights (when I was just about higher than my parents knnecaps). So, I built my own box just two years ago and put (for nostalgic and stupidity's sake) about 24 flashing LEDs of different colours! All my non-computer literate friends are impressed by what they think is a mini super cray!!! Anyway, that's the background to my explanation and insanity.

You can install LEDs in your box (as many as you want) as long as (1) your power supply can handle the current drain (you know the milliampere thing) and the rule here is that you should always allow at least a 20% safety margin, so if what your hooking up is rated at a 5 mA, calculate it as 20% more. (2) You MUST ensure that your connections are correct as per the LED manufacturers instructions/specs and that all your wired connections are secure, and properly insulated so as to not cause a short. Bear in mind that LED leads do get warm to hot and therefore care must be taken in mounting them to be sure they do not touch other wires and have adequate air/ventilation space (around 0.25 inches around). Other than that, everything should be OK. As for spikes or surges, this should not be a problem as all of the LEDs are operated on DC (Direct Current) and while they may add resistance to your power supply (assuming you're not hooking them in parallel or in series with computer components but off their own independent power supply lead) you should be OK.