The plastic has got the temps down about 2- 3c, from 29-ish to 26-ish. Theres about a 10cm gap all the way, which is allowing some heat to get by on the sides I think. I would have prefered to have it fit completely.

From my calculations, which may well be off, I'm losing about 1200 lumens, like a 20W cfl, which doesn't seem too much, and I'm hoping the lower temp
is worth it.
I don't think I'll be able to stuff the other lamp up, though I haven't tried, mainly because 650W for 3 plants seems like overkill, considering the electricity bill...

I'm hoping to be allowed to put a big old closet in a friends garage, in which case all 800W go up.

Just bought 30 quid of wire fence to scrog with and gave it up after half an hour. It's gonna take a bleeding whole day to push all those buds through, what with the working position being rather awkward and stuff.

Should have started that much earlier, I think.