Looking superb mate.
Took your advice and spent out on a BlueLab
Put 2 x Budzilla (Heavyweight Seeds) into a napkin but only one popped, so I chucked in 2 x 00 Skunk seeds (Seedsman); both of them sprouted within a couple of days.
The three are potted up, in some All-Mix and in the tent.
Main worry is the temps, loft is seriously chilly.
I've chopped up an old carpet and surrounded the grow tent. Effectively creating a tent within a tent. Hopefully this will dampen any thermal fluctuations, hot or cold. It also helps to conceal the grow and should provide a good odour barrier.
There's plenty of headroom so I made a plinth to raise the tent about 10 inches. I thought it would be more comfortable kneeling to work on the plants without having to stoop; I'm also finding it much easier to work up top of the tent as I can get my feet right underneath; good for storing things out the way too.
Pallet wood (clean and dry); covered with ³/⁴" ply; 50mm off-cut of Kingspan on top of that; underfloor heat pad straight onto the kingspan.
I glued a 6mm wooden bead around the edge of the kingspan and poured in a screed mix to level with the top of the bead; it's self-leveling, so you barely need to trowel it if you pour evenly, certainly doesn't require any skill...BUT, the Kingspan MUST be level.
I bought the higher 150watt (half a square metre so it will draw 75 watts) it covers the footprint of the tent perfectly.
Gave it a few days to dry and cure, and stuck my tent right on the top of it. It won't take being stood on, but there's no reason too with such a small tent.
The floor is toasty warm! I wired straight onto a plug and will probably keep it on permanently, easy enough to wire it through a thermostat at a later date.
The ambient temperature higher up the tent is still only 14c, probably because I keep opening it. I've ordered a tiny 250w fan heater (which I will definitely wire onto a thermostat). The 1ft 60w tubular heater I got is not really making much of a difference, except very locally, beneath the seedlings.
Screeded. The screed came in a plastic tub, all you have to do is empty the contents and stir; you will need a plasters paddle on a drill. Or a soup blender!
Babies strung over the tubular heater.
One up and running, two hopefully emerging in the next day or two.
Next I'll stick the big light up, guess I'll only need it at 30% for a week or two though.
Oh, and I'm using an old 1.5ltr slow cooker for humidity, seems to work a treat. Pour in boiling water, set to 'Warm' and leave the lid cocked.
So far, so good.