-----Original Message-----
From: [email protected]
[mailto:[email protected]]
Sent: Wednesday, January 24, 2001 6:15 PM
To: [email protected]
Subject: Lights for 3-meter Chamber
We are setting up a 3-meter chamber to do some pre-compliance measurements.
What are the best low emissions lights to purchase for this chamber.
Please be specific as to manufacturer and models.
Thanks
Joe Martin
Applied Biosystems
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The choice for internal chamber lighting is still simply incandescent bulbs.
Avoid anything that uses fluorescent lights, and also avoid any electronic
ballast or driver circuitry.
Incandescent lamps within chambers have a reputation for burning out
quickly. This is because they are turned on and off so much (I turn mine off
whenever I close the chamber door), and also because the lights are operated
off of filtered power. When the lights are off, there is often very little
load on the output side of the room filters, causing a slight voltage rise.
Thus, the lights are turned on usually with a slightly high nominal voltage
condition.
You can use expensive "traffic light" lamps, or you may find some industrial
bulbs rated for 130V or so. My position is ordinary light bulbs are cheap. I
just keep a case handy, and I bought one of those extension wands so that I
can change a bulb without even getting a ladder.
I also installed a couple of 150W floodlights, so that I can switch them on
to help my digital camera's flash when I take pictures. (The anechoic wall
treatment really soaks up the available light; I usually force the camera up
the equivalent of two "f-stops", even with the floodlights.)
Regards,
Ed
Ed Price
[email protected]
Electromagnetic Compatibility Lab
Cubic Defense Systems
San Diego, CA. USA
858-505-2780 (Voice)
858-505-1583 (Fax)
Military & Avionics EMC Services Is Our Specialty
Shake-Bake-Shock - Metrology - Reliability Analysis
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