I think that all hps need ballasts... along with all flurs... cfl's have the ballast built into the unit... there was some speculation on the board the other day about a hps bulb that had a built in ballast.. but nobody can get their hands on one... so it may just be a DREAM... lol

If you can ventilate and keep room temp at sutiable levels then go with the 150... the 250 ballast will probablynot work for the 150 bulb.... you will need a new ballast...

Ideal temp is 70-75.. but it is possible to grow in 85-90.... and a dedicated grower can do it.. you sound pretty dedicated..

: )
Garden Knowm Reviewed by Garden Knowm on . major heat problem!!! Gots a major problem. am using my bedroom closet which is the type that recesses into the wall. its a 7ft H x 2ft W x 2ft L and i wanted to use a 250Watts Hps. the main problem is that since its directly in my room leaving the closet door open is not an option. i fear that i am going to have problems with the heat. was planning to seperate the growroom into 2. A 2ft empty space above and 5ft of space to grow. could i just use two fans to ciculate the air between the 2ft free space and the grow Rating: 5