Safe temperature for operating lights...?
Posted 20 November 2008 - 01:02 AM
So, what are the dangers of operating lights outdoors during cold temperatures. Say about -10 degrees C. Should I be concerned about bulbs blowing out because of the extreme temp.? Is there any site to get information on this?
Thanks in advance!
Posted 20 November 2008 - 01:33 AM
I've had tungsten fixtures and kinos out in weather down to -5F or -10F without any special precautions and they were fine.
Posted 25 November 2008 - 05:26 PM
Posted 25 November 2008 - 09:19 PM
now that I think back, I would say its really not a concern once it gets really cold. Those lights and lenses never heat up in tempature that cold, so temp differential isn't really a concern. Big guns are another story though, not sure about those
Edited by Michael Collier, 25 November 2008 - 09:21 PM.
Posted 26 November 2008 - 05:06 AM
I've heard that in really, really cold temps you should leave lenses on HMIs and close the barndoors on all fixtures so it insulates the globe and slows cooling to prevent the globe popping from temperature diffences in the glass. I don't know how true or necessary this is.
The bigger wattage the lamp the more lens breaking problems. What causes breakage on lenses is the thermal shock. It's is the temperature difference between the hottest area on the piece of glass and the coolest. Basically, it's temperature on the center of the lens (hottest) and the edges of the lens. When using a Fresnel fixture 4K and up (to be on the safe side) always start your fixture in spot mode as it is the position where the bulb is the farthest from the lens. You let it heat up for 5 minutes and THEN start going to flood. Same thing when you turn off: go back to spot and close the barndoors and put scrims.
The rule is AVOID THERMAL SHOCK.
Posted 28 November 2008 - 01:58 AM
Posted 28 November 2008 - 03:39 PM
Posted 02 December 2008 - 02:47 AM
Posted 05 December 2008 - 09:07 PM