So far I think the results look pretty good. Looks like a lot of really green vegetative growth. not much stem elongation yet. But that's fine. I'm trying to limit the height anyway because my cabinet is less than 4 feet tall. Would like to know what others think. I'll upload some pics as soon as I figure it out.
Well, first off i have to say well done, looks like they have settled in nicely, instead of sayin stem elongation, just call it stretching, and its usually a bad thing, (nothing to worry about tho) but so far they arent stretched at all, so your doing great and try to keep them the same distance from the light as they are now, obviously a couple Cm's further away wont matter, but the closer your plants are, the more lumens they consume. good job fixing the heat problem, and like emmpey says, its a good idea to get a pH meter of some sorts too.

One last handy tip, you said you use tap water that has been sat for 24hrs, well if you can, its a good idea to use RAIN water, its full of minerals and goodness, and doesnt need sitting, just put a CLEAN container in your back garden and take it from that, if you can, pH test it, and your plants will thank you for it...

Anyways, good job so far, ill check back soon, Good luck....