Being that a friend of mine...

lives in an outdoor zone where tomatos flower all year round

how much light do you think it would take to PREVENT flowering. Like if he wanted to grow mothers vegetatively for a spell.

like a minute with a 100 watt bulb per day?

what is the minimum they might be able to get away with?

nobody heard of this?

I know indoors you have to be careful to not even use a flashlight. I guess I will have to be the test case

18 hours of light min to keep in veg , any thing less your chancing of them flowering