In article ,
Scott writes:
As I mentioned elsewhere, I am experimenting with LED lighting.

I was having a curry with a former colleague last night, who mentioned
his father hates LED lighting for the following reasons:

1. The spectrum is too narrow thus depriving the body of the right
kind of light.
2. HIgh frequency flicker, higher than fluorescents possibly
triggering migraine.
3. Because of the frequency (colour temperature?) the light does not
travel as far so streetlamps need to be placed closer together but.
Councils are not doing this for cost reasons, leaving blackspots in
illumination.

Is there any merit in these arguments?

No.

Lighting industry did lots of experiments with CFLs to try and
understand what people didn't like about them. However, it was
quickly shown that these people didn't like lights they thought
were CFLs and did like light they thought were filaments.
Since what they *thought* didn't match reality, it could only
be put down to physicological bias, not genuine physiological
issues.

Of course, there are poor quality CFLs and poor quality LEDs,
and if you buy those and don't like them, then don't be
surprised.

Some dimmable LEDs have no smoothing of the rectified mains,
so if you don't like 100Hz flicker of moving things, avoid
dimmable LEDs.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]