Hello and happy holidays to all. I have not really done anything related to lighting service but I have a friend who asked me to look at a metal halide light that keeps going on and off. It comes on and stays on for about a minute, then goes out for a few, comes on for another minute, and so on. Any suggestions on what to look at? I will take a look in the technical reference to see how these things are supposed to work. Thanks
Sounds like an end of lamp life scenario. Arc tube would be noticably darkened, or sometimes a bit warped.
Also may be an indication of: <OL TYPE=A>
[*]Input AC Voltage Is Too Low,
[*]Incorrect Lamp / Ballast Matchup, or,
[*]Excessive Heat Trapped Within Luminaire. </OL>
Don't exclude a "Logical Paradox" setup between the fixture and a Photocell which controlls it! (Light from fixture shines on Photocell, Photocell turns off Lamp; No light on Photocell, so it turns on Lamp; Lamp produces light output which is detected by Photocell - Photocell turns off Lamp; No light on Photocell, so it turns on Lamp: Light detected by Photocell..... yadda yadda yadda!!!) In BASIC, this would look like:
10: P AT 100: "Light On/Light Off" 20: GOTO 10 run
Scott " 35 " Thompson Just Say NO To Green Eggs And Ham!
Re: Metal Halide#32268 12/19/0310:44 PM12/19/0310:44 PM
I will look into replacing the lamp, it was in use for about a year, what is the average lifespan of the bulbs? If I remember correctly this unit is on 110, there is no photocell because this is an indoor installation. It is mounted right behind another much larger, I think about 250 watt this is a 90 watt, light, could heat be an issue? They are wall mounted in a rather large old warehouse, now an indoor rock climbing gym so there is also a lot of dust. I appreciate all your quick responses.
Re: Metal Halide#32271 12/21/0303:06 PM12/21/0303:06 PM