I have 4 seedlings in a 4’x4’x6.5’ tent. The seedlings are 1/2" to 1" tall.
I have a 1000 watt Metal Halide bulb powered by a dimmable digital ballast that has 100%, 75% and 50% settings.
Right now I have the light 28 inches above the plants, set at 50% power.
I’m looking for opinions as to whether this is appropriate, or if I should increase the power level and/or the height.
Heat is definitely not an issue in this case - I can barely feel any heat below the air cooled reflector. But, I’m not sure if the seedlings should have more light or not.