I'm working on designs for a new terrarium and I'd like to light it at night, both for the sake of viewing my plants and lighting my living room in the middle of the night. What type of light or filter could I use to do this? I have some plants that are sensitive to photoperiods, particularly my Schlumbergia, so I'd like to find a light that won't disrupt them. I was thinking something akin to moonlight would be ideal, but I don't know what kind of equipment I'd use. I assume that lights with low PAR emittance would be the least disruptive, but what spectrum is best? I once heard of using blacklights to this end, but I don't much care for blacklights. Any thoughts?