[AT] LED lights

[Stephen Offiler]

White, lighting-class LED's are readily available (in raw LED form) in
higher color temperatures.  The most efficient ones on a lumen-per-watt
basis are between 5000 and 10,000 color temperature.  It has been a bit of
a struggle for the LED industry to create "warmer" LED's down at 3000 but
they have done so because they believe the residential lighting market
demands the less-harsh, less "blue", more "warm" tones at 3000K.  I have at
least one BR-30 replacement LED (BR-30 is a 65-watt flood lamp used in
track lighting) that is "bright white", color temperature 6000+, and my
wife HATED it in the kitchen.  I am using it in my workshop where I am not
terribly picky about color as long as it's bright.

In the emerging LED residential lighting world:
"warm white" is down around 3000
"natural white" is about 4000-6000
"cool" or "bright white" is about 6000-10000

It tends to follow the language used to describe the color temperature of
fluorescents.

SO




On Wed, Nov 12, 2014 at 9:29 AM, Dan Glass <dglass at numail.org> wrote:

> I looked at Lowe's this morning at leds and not only are they $20 for an
> 100w equivalent they color temperature is no higher than 3000 degrees.
> I use CFL's now that are 5000 degrees and the light is much more
> pleasant and easier for me to see with and I can evaluate colors better
> with them.  I buy the CFL's are Walmart for about $3 each and the life
> is about 9 years.  Until they can raise the color temperature on led's I
> am not going to get them even if they are giving them away and use no
> electricity at all.
> On 11/12/2014 8:01 AM, Stephen Offiler wrote:
> > Fluorescents don't like cold, and depending on how cold, they can take
> > something on the order of minutes to come up to full brightness.  Some
> > fluorescents, using older ballast technology, will never start at all.
> > LED's love cold, the colder the better and brighter.  LED's dim as they
> > heat up.  Witness the fact that heat-sinking of LED's is a big deal.
> Take
> > a close look at some of the newest, high-output LED bulbs for 110V
> > applications.  You'll see a pretty fancy finned thing.  Heat sink.
> >
> > SO
> >
> >
> >
>
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