HDD & Power LED question

I was wondering how much current does the HDD and Power LED on a motherboard can support.

Basically, how many LEDs it could support.

On my case, Ive got 4 blue LEDs (2 beside a long piece of frosted plexi on each side of the front bezel) that should normally be always turned on (but doesnt, ill have to break these rivets and look at the wiring), and I was thinking about having either the top or bottom as the HDD activity, but I don't know if the motherboard could handle two LEDs.

Ill try to get pics of my case tomorrow... tried to find it on the net but can't find it. :(