Idiots guide to grow lights

Update on Red Robin progress under lights. Tomato plant No.1 has been on a windowsill with a nearby radiator, so had more heat than No.2.  No. 2 has been under lights in ambient with no extra heat nearby.

   

At 1/2/21

   

At 9/2/21

No.2 (under  lights) is a greener, sturdier plant

Note: two tumbling toms are not as sturdy.

I think lights are here to stay.