The noise we see from our metal halide lights are sporadic. It might be fine for many days or weeks but then give us fits on one particular day. We had our light circuit broke out so we can turn off the 6 fixtures nearest the antenna leaving on the two on the far end near the EUT. This helps but still on occasion gives us trouble if we are looking below the Class B limit. Then, like you, we are working in the dark. And of course, like during the Super Bowl last night, it takes 20 minutes for the lights to come back on.
My gut tells me the complexity of going LED will cause us more problems than it will solve, but at the same time we are always looking for better technologies. The Other Brian -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of McInturff, Gary Sent: Monday, February 04, 2013 2:12 PM To: 'Ken Javor'; '[email protected]' Subject: RE: LED Chamber Lighting Brian from a cheapy standpoint - we only leave the lights on when troubleshooting in the room and then I'm looking at some pretty specific stuff. I know our lights have noise but I know what it looks like. When I'm doing any sort of overall product measurement I simply turn off the lights and close the door. So much for stating the obvious. Gary -----Original Message----- From: Ken Javor [mailto:[email protected]] Sent: Monday, February 04, 2013 10:39 AM To: [email protected] Subject: Re: [PSES] LED Chamber Lighting I saw an amazing display of LED shield room lightning. The LEDs (and more importantly) all the wiring, are totally outside the chamber. A light pipe penetrates the chamber ceiling at regular intervals through a stuffing tube (waveguide beyond cut off). It should be noted that this chamber has white absorber; this would not have worked with black ferrite tile or blue cones. At least it would have taken many more luminaries. Ken Javor Phone: (256) 650-5261 > From: "Kunde, Brian" <[email protected]> > Date: Mon, 4 Feb 2013 18:22:05 +0000 > To: "[email protected]" <[email protected]> > Conversation: LED Chamber Lighting > Subject: 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 > > > ________________________________ > > LECO Corporation Notice: This communication may contain confidential > information intended for the named recipient(s) only. If you received > this by mistake, please destroy it and notify us of the error. Thank you. > > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society > emc-pstc discussion list. To post a message to the list, send your > e-mail to <[email protected]> > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieee-pses.org/emc-pstc.html > > Attachments are not permitted but the IEEE PSES Online Communities > site at http://product-compliance.oc.ieee.org/ can be used for > graphics (in well-used formats), large files, etc. > > Website: http://www.ieee-pses.org/ > Instructions: http://listserv.ieee.org/request/user-guide.html > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Scott Douglas <[email protected]> Mike Cantwell > <[email protected]> > > For policy questions, send mail to: > Jim Bacher: <[email protected]> > David Heald: <[email protected]> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]> ________________________________ LECO Corporation Notice: This communication may contain confidential information intended for the named recipient(s) only. If you received this by mistake, please destroy it and notify us of the error. Thank you. - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
