I have got a double ended venture lighting metal halide light and need to know which way up it goes. Sounds like i'm a complete noob, well i am really. The specs say HORizontal +-45°, but which is the top of the bulb? It has two flat ends with the contacts inside, the discharge chamber is elipsoid with a coating on the "bottom" third. There are two glass "seals" on the "top" of the inner chamber and the quartz outer. If anyone can show a picture of the orientation required for this type of lamp where it is replacing the light of an OHP (ie most light has to go up) I would be most grateful. 😕
You can mount it as you like, as long as you obey the 45 degree rule. What side is pointing forward doesn't matter. The coating is the stuff that defines the color temp of the bulb, when it gets hot it vaporizes and will join the plasma arc between the two electrodes in the bulb. When cooling off it condenses to what is then the 'bottom' of the bulb. Just make sure it doesn't condense near the electrodes, as those spots will not get as hot, and next time not all will evaporate and even react with the quartz glass of the bulb (reducing life of the bulb)
My English must be worse than I thought...
The 45 degree angle is to prevent the filling to condense at 2 electrodes. You can mount it on a rotating grill if you like...
JUST DONT LET ANY OF THE 2 ELECTRODES IN THE QUARTZ CONTAINER POINT DOWNWARDS
The 45 degree angle is to prevent the filling to condense at 2 electrodes. You can mount it on a rotating grill if you like...
JUST DONT LET ANY OF THE 2 ELECTRODES IN THE QUARTZ CONTAINER POINT DOWNWARDS
Its nothing to do with your english its probably my english thats at fault. The rotating grill analogy is all I needed, thank you very much, now to see if i can get this light in the right position to give some decent lumens on screen.
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