As fluorescent lamps age, the electrodes evaporate and there will be diffusion of the gas from the enclosure. This leads to increased power draw from the ballast, and therefor increased emissions. However, these effects are mostly noticed close to the end of the life of the bulb.
I don't know enough about the ballasts to comment. I can only speculate about how they will age. I would imagine you would see effects resulting from the electrolytic capacitors drying out and such. Ted Eckert Compliance Engineer Microsoft Corporation [email protected] The opinions expressed are my own and do not necessarily reflect those of my employer. From: Derek Walton [mailto:[email protected]] Sent: Tuesday, February 23, 2010 1:23 PM To: [email protected] Subject: Re: Fluorescent lamps Yes..... :-) On 2/23/2010 3:06 PM, John Woodgate wrote: > In message <[email protected]>, dated Tue, 23 Feb 2010, Derek > Walton <[email protected]> writes: > >> n testing fluorescent lamps for EMI I have noticed variations with >> lamp and ballast age. Does anyone know of a study done on emisions >> from aging fluorescent fixtures? > > What sort of ballast, passive or electronic? - 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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. 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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. 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]>
