Has anyone tried the following:
- disassemble the LED lamps and separate the LED portion from the Driver
Portion
- put a filter at the point of entry into the chamber
- Have the LED portion in the chamber, and the driver circuits outside the
chamber.
==========================
second try:
- open the lamps
- Measure the forward voltage on the LEDs with an oscilloscope
- Calculate what current will be needed to get the rated power
- disassemble the lamps and separate the LED portion from the Driver
Portion
- discard the Driver portion
- Get a DC power supply with a voltage higher than the peak voltage found
above and limit the current to the one calculated above
- If the power supply is a switching mode type, add a filter
- Have the LED portion in the chamber, and the DC power supply outside the
chamber.
Any other ideas to generate a clean DC current?
Kind regards
Rene Charton
"Kunde, Brian"
<Brian_Kunde@leco
tc.com> To
Sent by: "[email protected]"
[email protected] <[email protected]>
cc
02/05/2013 02:22 Subject
AM LED Chamber Lighting
Has anyone tried out LED Lighting in EMC test chambers? If so, can you
share your experience, opinions, likes and dislikes, and cost?
I have recently seen several ads for LED Light Fixtures and replacement
kits where a 100watt LED light can replace a 400 watt Metal Halide bulb or
fixture. But I have some concerns:
1. Are LED as bright?
2. The ETS-Lindgren datasheet claims "No RF Noise into the test chamber".
Seems too good to be true. Are these lights special for ETS or are there
over the counter LED fixtures that will work just as well?
3. Cost? Are there generic lights that would work as well but be cheaper?
If I hold off a year or two do you think the price will drop significantly?
4. What other pros and cons are there?
We have eight metal halide light fixtures in our chamber. Currently we have
to replace the bulbs every two years because of rf emissions from bulb
arcing. We replace the ballasts at 10 years because of loud buzzing. Though
the metal halide bulbs are relatively inexpensive, we have to rent a lift
for several days to work on the lights. Plus the cost of having the lights
worked on every other year and our chamber being down for a few days. LED
lights have the potential of being maintenance free for 15 years or more.
In the long run it should save us money. This might be something to put on
my capital equipment list for next year.
I'm curious to hear any input you might have on this topic.
Regards,
The Other Brian
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