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My M-400A2 on my Light Pole
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this was a royal PITA to install on this lol. At first i was like "oh this will be easy it's a power door. I'll just install the power door after i bolt the fixture" Well, i installed it and couldn't get it to be level. all it did was sag down. So i installed it on the stopper, making it tilit upward. still not level but at least it's not drooping... The M-400As and M-400 split doors always tilted upward anyways because of the rocker. So i finally get the light moutned perfectly and find out the power door needs about another two inches for the hinges to drop in place so i have to loosen the fixture and turn it sideways so the pole is not in the way and i can slip on the power door, holding the power door in one hand and supporting the fixture in the other. Then i got it on, connected the two wires, installed the refractor, and all done!
removal was easy. I removed the refractor, opened the power door and disconnected the power leads, unbolted the fixture, shut the power door, and pulled it right off! I only did this for the pic. Not how the pole is leaning forward compared to the wall in the background. Then look at the pic i psoted with my RMA on it. With the RMA the pole is level with the wall in the background, as it should be.
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My OVC is nearly silent but i would be worried if a tiny little choke was loud lol. My M-250A is quiet and so is my OV-10. My M-400 and M-250R1 are my loud lights and go figure, they're NOS lol. The M-400A2s have a little buzz to the but nothing major.
My NOS 250w Advance MH ballast is pretty noisy though.
The only large brands of HID ballasts I don't have is Universal, and GE.
I wonder if they used 150w HPS medium fixtures on the Mass Pike to have a more consistent look or to standardize the type of fixture used.