well it all comes down to the bulb design, MH bulbs have no current limiting device in them whats so ever so as they warm up there resistance will drop causing them to accept more power. so running a 175 off a 400 watt will probably result in a melt down at best. now as for running two 175 watt bulbs off one ballast there are a couple problems.
the first being as there is no current limiting device except for the ballast you have no way of insuring the power is split evenly between the two bulbs. in this situation which ever bulb heats up faster will draw more and more power which will cause it to heat up more and then draw more power (you can see where I am going).
the second problem is one ballast cannot supply enuf starting current for two bulbs.
all and all, I think this would be a dangerous thing to try.
Steve
__________________
 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
Some strive to be perfect.... I just strive.
|