I have 600, 1200 and 2000W UVA-B bulbs. (hps type not the flourescent)

which is the most suitable bulb for a 18 Sqft area? (I have 2 X 400hps)

At what stage of flowering should I use it? All the way or last few weeks?

In flowering period, how long should it be on daily?

Whats the suggested distance between those lamps and the plants?

Can there be a major heat issue?

There are downsides of using those lamps. SInce there wont be any filter as in sun beds I can not be in the grow room when it is on eventhough I have protective gogles. This is my major concern about using it.

If you guys think I could have better harvest with those bulbs I will try it for my next grow...

Let me hear your ideas, suggestions
paparose Reviewed by paparose on . UVA-B Questions I have 600, 1200 and 2000W UVA-B bulbs. (hps type not the flourescent) which is the most suitable bulb for a 18 Sqft area? (I have 2 X 400hps) At what stage of flowering should I use it? All the way or last few weeks? In flowering period, how long should it be on daily? Whats the suggested distance between those lamps and the plants? Rating: 5