I thought maybe it just needed a few hours to warm up to full brightness and I had just fired it up last night for an hour or so. I figured that today it might be brighter but it is not.
I am using a 250 W MH and it doesn't seem too bright. This ballasts wattage is unmarked but the other 2 ballasts I have are. There is a slightly larger ballast which says 175W (shouldn't a 250 ballast be bigger than a 175) and an enormous one which says 400w/x2 (this ballast lights two independent bulbs of 400 W).
What I'm wondering is if the 175W and 250W might have got their labels mixed up? What would happen if I were to test that theory and put the "175w" ballast on the 250W bulb just for a few minutes?
Is there a way to know for sure that this is a 250 W bulb? Perhaps this is the 175W bulb and that's why it's so dim?