OK, I'll come out of the Stone Age [Linked Image] Renosteinke's hit it right on the head.

I've used the T-5 HO fixtures a few times and they are absolutely great. Some benefits:
No waiting for it to start, and no restrike lamp needed.
They can be fitted with emergency battery packs for egress/EM use.
Very lightweight
Use much less power than an HID.
Most importantly...Ruud sent me a coffee cake at Christmas [Linked Image]