Quote Originally Posted by smoknjoe
...I would still like to know if its better to use an HPS ballast or MH ballast.
The ballasts use the same energy so in that field it does not matter obviously

A mh convertion will give more blue and a hps convertion will give more yellow.

What are you asking, which is better for what, they have different purposes?

Look up the degree Kelvin for each bulb if you are interested in the spectrum they produce and I can show you how to convert it into nanometers and the average color of the bulb.
Chris Seekins Reviewed by Chris Seekins on . MH and HPS conversions So, if I understand this correctly.... They make MH conversion bulbs that can be used with both MH and HPS ballasts. and They make HPS conversion bulbs that can be used with both MH and HPS ballasts. Is this right? So, if I wanted to use MH during veg and HPS during flowering, I could buy a MH system and an HPS conversion bulb, or I could buy an HPS system and a MH conversion bulb, right? Rating: 5