It's really not recommended. It will stress them. Especially in the vulnerable seedling stage, constant light schedule and temperature are important.
Since you only need a couple more weeks, it's not big thing to stick a couple CFLs somewhere like in the bathroom where you can leave the lights on 24/0 until the grow chamber is available again. Hint, it takes about a week between wetting the seeds and seeing them emerge from the soil, so you REALLY only need a spot for a week or so.