I'm sure a closet grower is not on the radar unless they're insane, lol.

New computers today have 1000 Watt power supplies available, with dual graphics cards etc etc etc.. so they really can pull near the full capacity with normal use (by a gamer or video editor).

My whole house has been on CFL's for years already, because I believe in them. I love using 15 watts to light a room instead of 60 Also if you have a big tv, remember that sometimes "standby" power draws far more watts than you probably think. So physically get up and turn it fully OFF.
Got a electric hot water heater without insulation? Why? Do you REALLY need the heat up so high on your water? Turn if down a few degrees. It's just a knob. Is your fridge mostly empty? Put lots of stuff in there. A full fridge/freezer is far more efficient than one full of air!

Etc etc.. For the small personal grower I think you can more than offset a single light fixture, even if it's on our radar as something to be concerned about.