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Posted to uk.d-i-y
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LED lamps
On 09/11/2020 20:25, Paul wrote:
Max Demian wrote:
On 08/11/2020 23:30, wrote:
On Sunday, 8 November 2020 09:12:11 UTC, PaulÂ* wrote:
And the color temperature and CRI, tell you what the
light will look like. The three on the right above are
2700K 90CRI, which means roughly "almost the same as
an incandescent". A warm-ish light, suitable for reading.
The 5000K 85CRI bulbs I bought, the floods, those
are dreadful, and I can't use those for anything.
And I don't really understand what goes on with those,
as the light is "white", but it's also "bleh" and
indescribable in any meaningful way. They don't
look bluish, as the 5000K would hint, there's no
sign of blue the way some bulbs at that color
temperature look. But the light is just awful
and you just want to turn it off. It's "poke in the eye"
awful. I'd rather light the room with a magnesium flare.
Â*Â*Â*Â* Paul
5000K means more blue & less red. It still looks white, just nasty.
People in cool countries mostly like warm white, which is of course
lower CCT.
People in warm countries mostly like cool white, which is of course
higher CCT.
White LEDs are cool white by nature, warm white ones have pale yellow
or less often orange colour over them.
I would have thought that most white LEDs are *blue* by nature, with
fluorescent dyes to (more or less) fill in the spectrum. Others may be
RGB, but probably only so the hue can be adjusted.
I have seen nice looking 5000K lights.
One of the reasons this light bothers me,
is looking at it, you can't identify the flaw.
The spectrum shows it has a blue spike. Yet the
visual appearance doesn't have "the usual blue look"
to give that away. When I look at it, it's "flat white",
which as a statement makes no sense at all. There's not
a hint of blue in it, to the eye. And the CRI value
isn't bad enough to condemn it either.
As a result, the bulb holds a classification all of its own.
Unfit for any usage.
Why is it important to have a flat spectrum?
--
Max Demian
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