Might only be referring to the cheap ones you can get online that just put a
bunch of LEDs in series, sometimes without even a half-wave rectifier. First
line glitch and at least one of the LEDs is toast and the bulb is history.
Anything truly worth buying has a power supply built into it like you describe
and I won't expect to see any flicker unless it is a really bad power supply in
the bulb.
--Dan RomanIEEE Senior MemberPSES/EMCS/[email protected]
-------- Original message --------
From: Ken Javor <[email protected]>
Date: 7/29/17 11:43 AM (GMT-05:00)
To: [email protected]
Subject: [PSES] Flicker from LED and CFL light bulbs
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 doesn’t agree with the article, which says LEDS basically
turn off when ac mains potential goes to zero.
Ken Javor
Phone: (256) 650-5261
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