That Galaxy ballast will run both HPS and *regular* MH bulbs just fine.
You do not need a conversion bulb to switch back and forth with an electronic ballast like that one.
If you want to veg with MH, you can just get a regular MH bulb for a lot less money than that conversion bulb.
I'm surprised your hydro store didnt know that or that they just wanted you to spend more for a conversion bulb.
regards,
SS
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