Growing Seedlings in a 4x4ft Grow Tent With T8 LED Grow Lights

For growing plant seedlings in a 4x4ft grow tent, you will typically need:

4-6 pcs of T8 LED grow tubes, with each tube having a wattage of 32W-40W.

For seedling and vegetative growth stages:

You'll want higher light intensity, so use 6 tubes of 32W each (192W total).

For flowering/budding stage:

You can reduce to 4 tubes of 40W each (160W total) as plants need slightly less intense light.

The recommended bulb spectrum is:

Cool white (6500K) or full spectrum for seedlings/vegging.
Warm white (2700K-3000K) for flowering.

Place the tubes about 2-6 inches above the top of the plants and raise them as plants grow taller. Make sure the whole grow area is evenly lit.

Having 4-6 T8 tubes in that 4x4ft area will provide the right light intensity for healthy seedling growth without going over budget on electricity costs.