R00KIE said:
StonedGrunt55 said:MY 400watt MH i had to make abit higher 1 meter cause due these day's temp the MH put more heat & i ended up with heatstress on my 5 (26day) plants,cause when i made it 20 inches above the growroom temp reached fuckin 100f I'm told that HPS puts less heat but can switch 400 MH bulb with a 400 HPS one ???? or i'll have to buy the whole HPS system???? THO THE BULB LOOK THE SAME
Tnkx alot obli, i didn't know about these kind of lights like HPS & MH before i started growing, i was told the MH is good for grow (its true) but only after i bought it i learned about the heat it throws & even the electronic ballast u mentioned didn't know about it till now that u told me cause if there is one thing i never got intrested in my life is electricity & stuff. 1 thing i'm thinking about is switching their day/night cycil ,i'll light them at night & switch them off during day, cause most hot weather is during the day OF COURSE ITS HOT HERE temp can rise38-40c sometimes & 2 summers ago it reached 44cOblidio49 said:IMO HPS puts out less heat because most HPS buls are more efficient than MH bulbs.
You cannot switch to HPS unless your ballast is designed for both types of bulbs. Some ballasts are "switchable" for that purpose. Make sure what kind of ballast you have before trying a HPS with it.
Which is the reason I bought an electronic ballast for my 400Watt system. I can use any 400-430 watts bulb in it. It also runs very cool, makes NO noise, and operates my lamps at 95%+ efficiency....meaning less heat and more light for my 400 watts of input power. It is blue in color and name is "Future-Brite Model MH-HPS 400Watt".
Works like a charm. Another advantage of electronic over magentic ballasts is restarting after an unexpected shutdown. No problem with an electronic ballast. It starts back up automatically when it is safe to do so.
I don't know why anyone buys magnetic ballasts for 400 watt systems unless they are just dirt poor and don't mind the noise...but each to his own
Good luck with it and thanks for your compliments on my grow pages. My plants are doing sooooo well and getting close to chopping time
Obli
PS
Must be fucking HOT where you are. I never had my 400 watt MH or HPS more than 12 inches from top of plants. Just lately are my grow temps getting consistently above 80F. most of the time its 70's high 60's at night.