400w MH bulb for 600w ballast?

skunkd0c

skunkd0c

Well-Known Member
This is simple ohms law
as long as the bulb does not exceed the ballast rating it is fine and safe to run
the ballast voltage for 400w and 600w are the same, the extra current needed to supply the 600w is possible because of the lower resistance of the 600w bulb

problems would only occur if you put a higher rated bulb in a lower rated supply, the bulb being much lower in resistance than the supply it is intend for , would attempt to draw more current than the ballast could produce which would in-turn burn it out or short an internal fuse if it has one
 
choempi

choempi

Well-Known Member
skunkd0c said:
This is simple ohms law
as long as the bulb does not exceed the ballast rating it is fine and safe to run
the ballast voltage for 400w and 600w are the same, the extra current needed to supply the 600w is possible because of the lower resistance of the 600w bulb

problems would only occur if you put a higher rated bulb in a lower rated supply, the bulb being much lower in resistance than the supply it is intend for , would attempt to draw more current than the ballast could produce which would in-turn burn it out or short an internal fuse if it has one
Click to expand...
Peeps that are buying mh conversion bulbs when they have hps ballasts and buying smaller ballasts to run smaller bulbs are duped
 
Growse

Growse

Member
It works ,your ballast might get a little bit hotter, but it works. Ive got a 400mh bulb in my 1000w ballast. Gets hot, but works fine if you have the proper saftey precautions.
 
CDNSTEVE

CDNSTEVE

Member
I recently just set my stuff up ,being all excited never give it much thought if my ballast was tuned properly? Light was working fine the whole two weeks since... when I looked, it was turned on 600w so switched it back . Differance was the heat of the bulb and brightness seemed to go more white then a yellow .Lost a few degrees which is nice . I think this is not great method and don't recommand it if you can get the proper ratio bulb to ballast .
 
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