Can I use 400 Watt HPS bulb in a 500 Watt Ballast?

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dogsgoarfarf

Member
Hello everyone setting up my first grow today. Got a hydroponics kit and I have two light setups. 1 150 watt HPS and a 500 Watt hps. Im sure it is okay to use a 400 watt bulb in a 500 watt ballast but I just wanted to make sure here. Anyone know? I want to get a MH conversion bulb so I can use the MH bulb in my HPS ballast. So is it okay if i get a 400 watt conversion bulb to place in the 500 watt ballast? thanks very much for the help!
 
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guerillabud

Member
It will fire up the bulb but the bulb will burn out very quick, learned that hard way several years ago. You need a 500W bulb for a 500W ballast.
 
HomeGrownHairy

HomeGrownHairy

Well-Known Member
dogsgoarfarf said:
Hello everyone setting up my first grow today. Got a hydroponics kit and I have two light setups. 1 150 watt HPS and a 500 Watt hps. Im sure it is okay to use a 400 watt bulb in a 500 watt ballast but I just wanted to make sure here. Anyone know? I want to get a MH conversion bulb so I can use the MH bulb in my HPS ballast. So is it okay if i get a 400 watt conversion bulb to place in the 500 watt ballast? thanks very much for the help![/QUOTE

No, don't do that. You need to match the wattage of the bulb with the wattage of the ballast.
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guitarzan420

guitarzan420

Well-Known Member
i haven't seen a 500 before, but I'm sure someone probably makes one i'd like to know. i'll check back when you find out
 
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