On the side of the light it says Hydrofarm, 400watt 120v 4.0a 60z and says use only 400watt Metal Halide bulbs M59 type lamp. When I also got it from the friend he still had a old burned out 400watt metal halide bulb in there, i bought the same bulb that was in it. What is the cap and how can I replace it? Unsure of that one.
Kwali Reviewed by Kwali on . Question about MH lighting A few days ago a growing friend gave me his old 400watt MH hydrofarm grow light with a built in ballast. So I went out and bought a 400watt MH light that fits the requirements listed on the growlight. Now when I went to turn on the light it didn't come on right away, which I wasn't worried as I've heard it can take up to 5mins. But after 10mins it never came on, same after 30mins and a hour. I checked the bulb while it was in and turned on and inside the middle part there was like a little Rating: 5