Just read an article here: http://www.dailymail.co.uk/health/article-4739766/Low-energy-LED-lightbulbs- giving-HEADACHES.html#newcomment
It says that mains frequency flicker (in the light output) from subject luminaries causes headaches. At least in the USA, I see power supplies converting ac mains to a dc potential driving the light element. Is it different somehow in the UK at their higher mains potential and lower mains frequency? Is there anything to such flicker? Could it be ac ripple riding on the dc? But that doesn¹t agree with the article, which says LEDS basically turn off when ac mains potential goes to zero. Ken Javor Phone: (256) 650-5261 - ---------------------------------------------------------------- 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://www.ieee-pses.org/list.html (including how to unsubscribe) 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]>
