I've already told you that I'm not particularly careful with my seedlings: I don't use any extra light sources or try to keep them warm. Mostly my strategy so far was to get them used to a 'grown-up' life as soon as possible,
and it wasn't as bad an idea as you might think. I guess, the chances also depend on the kind of lithops, but watching their development closely it's still possible to step in if something goes wrong. Here's a sample of the kids I've sown in April 2008 (This was my first attempt and I got some of them burnt by the sun. I could avoid that mistake the year after).

I let them 'hatch' in a normal cacti soil you can get in every store sometime in early spring (march or april) on a south windowsill. For the first two months they mostly stay under a see-through cover to keep the soil moist (so I don't have to mist or water them every day) - I would remove the cover every now and then every day to let fresh air in though.

On the picture below you can see the same aucampiae v. koelemanii C256 (l) and lesliei v. minor C006 (r) in June 2008 and in November 2008.
I've already posted pictures of the same lithops plants taken in September 2009 in this post. Please check them out!
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