Light bulbs with a color temperature around 5500 Kelvin, with a high CRI (color rendering index) look like a cold blue that a bunch of people don't like, but out of the corner of your eye, or around a door, it seems like there's a bright sun outside. Which is particularly weird in the middle of the night.

I got some from here: http://www.alzodigital.com/online_store/light_bulbs_compact_fluorescent_hid.htm
The 27 watt bulbs are very bright (like 123 watt incandescent?). And they buzz.

More geeking.