HID Lamp

[wordwiz]

I got my lighting system in today... what's a good height for the light to be set at? Is it like 4 ft from plant canopy? I have a 400W Halide Bulb in at the moment.

I like to use a light meter. If I'm trying to grow seedlings, then 5,000 lumens is enough and I can raise the light to cover more area if I need to.

Mike

 

[willard3]

I use MH and HPS lamps and they don't need cooling if you have a fan in the grow space.

Cool tubes are for growing in extremely confined spaces that have no heat loss.....an interior closet, for instance.

 

[ExtremeBurn]

I have a fan in the growing area and it stays nice and cool. I'm using an agrosun 400w halide lamp and I leave it on 16 hrs a day and never gets hot in my grow room.