Indoor lettuce farm

I got about 48 lettuce plants donated to the garden club, but almost all of them died in my office during parent-teacher conferences.  Six managed to survive, somehow, despite being left on the porch last week in 20 degree weather.  Today, I built them a PVC grow light stand and set it up in the basement.

Closer:

Even closer:

Closerer:

Uncomfortably close: