I wouldn't use a 1k light in a C22 cabinet. Not because it can't be done, but because the amount of area in a C22 is pretty limited, and a smaller light can handle the smaller area, and do so while using less power and causing fewer heat-related issues.

A 600w light with a digital ballast and a cooltube would be my recommendation, or (for more light placement flexibility), a 400 watt light and some warm CFLs at the edges of the long part of the rectangular area. (This works really quite well.)

Here's a 400 watt light in cooltube with accent CFLs (one set of four 30-watt warm CFLs on each side). The cabinet pictured is very close to the dimensions of a C22. A 1k light would pierce the canopy better, but that canopy is just the unfortunate consequence of me having to leave town for a bit and not wanting to be flowering while I was gone, so they got an extra six weeks veg. In normal circumstances (e.g. much less time in veg), that would be a standard ScroG and the canopy would be nowhere near that thick (and the lights would be a lot lower).