I'm not sensitive to flicker, but the point sources from undiffused LED arrays like our new street lights or security lights really hurts my eyes at night.
-Dave
From: Harvey White <madyn@...>
To:
[email protected] Sent: Saturday, July 14, 2018 5:21 PM
Subject: Re: [TekScopes] OT: LED lamp bulbs at ridiculously low prices at (some) Costco stores
On Sat, 14 Jul 2018 15:47:47 -0400, you wrote:
Ed,
(Sorry, careful searching for Ed¡¯s actual email address revealed nothing.)
I know someone who is very strongly opposed to LED lamps of all kinds (also to halogen lamps). She is certain that LED lamps are very, very bad for humans.
I have not investigated the situation, but I suspect that SOME LED lamps actually put out a chopped, non-continuos light.? Do you know anything about this?? It seems that the normal tubular fluorescent lamps we have used for many decades do in fact emit a pulsating light, and that some few people are actually do have a negative reaction to the light.
The LED itself, looking at the actual part, puts out a monochromatic
light (with the exception of the blue/violet/UV/white which is
essentially UV exciting a phosphor).? The on/off ratio of a pulsed LED
is essentially the light modulation frequency.
Some people *do* have a reaction to LED light, but the same reaction
has to do with the frequency of the light flicker and not the source.
In some people, it can trigger epileptic siesures.? It has to do with
the flicker frequency.? You will find warnings on some video games for
the same thing.
On a related topic: just how much mercury is in the compact fluorescent lamps that are apparently not on the market any more.
Enough......
In both these situations, I suspect that a heavy dose of alarmism based on some very poor science and the absence of relevant facts is in play.
Naaah......
Harvey
Roy
Roy Morgan
k1lky68@... <mailto:k1lky68@...>
On Jun 25, 2018, at 12:11 AM, Ed Breya via Groups.Io <edbreya@... <mailto:edbreya@...>> wrote:
This is OT, but I just have to say I happened to stop by the Fremont Costco today, and stumbled upon some amazing deals on certain types of LED bulbs, like six-packs of PAR-xx/xxW equivalent spots for two dollars, and other stuff.
