Gardening: (2016– ) in Food Traditions & Culture Posted Sunday at 09:28 PM Dimmers are not an issue - the lights I've been experimenting with are 24V DC, and I found a great driver which is dimmable by varying the resistance across 2 terminals - very easy for me to integrate into an automated control system, or just with a variable resistor. Are the 120V COBs dimmable? I'd assume not since the driver is built-in... I was planning on having the tree lit with different lights than the rest of my plants because the new apartment is a loft space, so I'd rather not have blinding lights on while we're sleeping! So if I was to give the tree 16 hours of light, I'd have the lights turn on around 6AM and turn off at 10PM which will coincide nicely with our normal schedule.