Growlights how long to use per day

You can go to Lowe's and they carry 4 ft. long fluorescent bulbs for growing
plants and they also say that they can be used for fish tanks. I used them
last year and am using them now and they do a great job. Cost is $9.95 each.
I keep my seedlings just one inch below the lights and keep the lights on
them for 14 to 16 hours a day. Do not keep the lights on 24/7. Believe it or
not, the seedlings need 8 hours of sleep (unless they are in the far North - those seem to be fine with light day and night in the summer - JK).

In four weeks, my tomato plants were ready for transplant into larger
containers. Egg plant also. To slow down the growth, cut down the time they are
under the lights and just give them window light.