"lsmartino" wrote in message
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On 29 abr, 12:01, "Arfa Daily" wrote:
"William Sommerwerck" wrote in message

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Yes, indeed -- I am colour blind, and if that is what makes the
difference between someone who does have an issue with
CFLs, and someone who doesn't, then 12% -- one eighth --
of the population being forced to suffer because of this legislation,
seems a pretty poor show of arrogance by the powers that be, in
insisting that we suffer in the way that we are being made to.

I assume you suffer from protanopia or deuteranopia. My father did. (I
don't.)

I worked with a guy with that problem. One day he asked me to help him
pick
colors for a Web site. It was causing him all kinds of confusion. I
showed
him a fluorescent-green pen, and asked him what color it looked to
him --
"Orange". (That doesn't mean he saw it in the way a person with normal
color
vision would see orange. Rather, he could not distinguish it from what
we
would call orange.)

Peter Wensberg, the author of "Land's Polaroid" (a beautifully written
and
wonderfully entertaining book) told how, during a lunch of Chinese
takeout,
Dr Land administered one of the standard color perception tests (the
kind
with colored circles, where you indicate which letter or number you
see).
Wensberg utterly flunked it, getting every one wrong.

I've lived with fluorescent light for more than 60 years, and have
never
suffered (except in my early days at Microsoft, when the office lights
gave
me (and some others) headaches). It appears to me that your suffering
is
primarily aesthetic.

As I've said on a number of occasions, linear flourescent light doesn't
affect me in anything like the same way as CFL. I can read perfectly well
under it. I work perfectly well under it. I don't find the light
displeasing
in either colour or quality. I don't know how to reconcile this apparent
disparity, as I too have lived under flourescent light for over fifty
years.
I don't know what my type of colour blindness is called, nor whether it
is
common in type, or rare. I am apparently red blind and green insensitive,
as
far as I recall. It is many years since I took the test. I think it meant
that I couldn't see some shades of red at all, when they were mixed in
with
other colours, and that I couldn't distinguish some shades of green
amongst
other shades of green. Oddly enough though, the light from CFLs always
appears to have a slightly 'sick' green caste to me, irrespective of the
quoted colour temperature.

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Linear flourescent tubes usually uses a type of phosphor called
halophosphate. That phosphor normally emits light in a very narrow
band of the spectrum, and since you are collor blind, probably what
happens is that your eyes are fully sensitive to that particular band.
In the other had, halophosphate phosphors aren´t suitable for CFL´s
because they produce less light output than triphosphors. A
triphosphor can be seen like a mix of three different phosphors, each
one emitting in a particular band. The sum of all three produces the
light coming from the CFL tube. Probably you are blind to one of these
bands, making you uncomfortable with the light.

This is just a theory, of course.

Nice explanation, and seems on the face of it, to hold water. Good that
someone can actually come up with a reasonable theory, instead of telling me
that the problem doesn't affect them, therefore I must be wrong, or using
the wrong CFLs. I really have tried to embrace these lamps since their first
inception, but the fact is that for practical reasons, as discussed, I
simply cannot get on with them. Yes, I hate the fact that they have been
forced on us for dubious reasons of ecology, and I freely admit that does
colour my perception of them a little, but my fundamental problem with them
is just that - they are a problem to my (obviously defective) eyesight.

Arfa