It arrived today! The light!
It was packaged really well for transit. The bulb is bigger than I imagined it would be! But the fitting is designed to be suspended down. I need a horizontally placed light here, so I just strung it out inelegantly between some wire in my enthusiasm to get it ready for testing out tonight/morning.
I also whitewashed the inside of the lid, at the behest of someone that knows better than me. I was determined to leave the glass clear because I wanted to see the seedlings through the door, but I'm often away for two-three days at a time, and I didn't want babies to die of overheating if some freak hot sunny spell hit. I also imagined opening the lid on days I'm here - even though there is good ventilation in the box, I still think of 'fresh air' as best!
Hmm.. so, where was I? I was talked out putting foil on the ceiling as both solution to overheating and light-reflector, as this would have required fancy (as yet non-existent?) remotely controlled robotic arm to open up box for daylight/breathing every day I wouldn't be home
Anyone have experience on how well whitewash allows good photosynthetic light to enter glass houses? My more knowledgable friend assures me that with lid closed enough light diffuses through to enable good growth. (I trust their knowledge - I just have no experience in this area.)
So... by this evening when the fading light defeated me, the project looked like this:
Thanks for your encouragement, Lorn.