Last year we bought one of those little kits to grow your own crystalline Christmas tree. I wanted to do a time-lapse of it growing but unfortunately the lights ran out of battery during the recording and we ended up with a huge chunk of dark night being filmed!
But it did grow and well, according to the instructions they should last approx. 30 days.
1 year later we bought another one to grow and threw away last years, 12 times the expected life span!
Last night I set up the same camera unit with 30 second time-lapse setup, but to make sure the light didn’t fail overnight I plugged in one of the low power LED lights from my photo studio.
It worked very well!
A selection of crystal trees on Amazon – http://amzn.to/2iboLfE