On Wed, 17 May 2017 23:46:07 +0100, Rod Speed wrote:



"James Wilkinson Sword" wrote in message
news
On Wed, 26 Apr 2017 22:08:33 +0100, Rod Speed
wrote:

James Wilkinson Sword wrote
Rod Speed wrote
James Wilkinson Sword wrote

With a few junctions and a few phosphors, I can't see why we can't
make
a real sun spectrum.

Because the sun produces a quite uniform spectrum because of the way it
emits the light.

So?

So you'll never get even close with leds.

Put several LEDs in the package,

All that does if put more spikes in the spectrum.

then add phosphors to smooth things over.

Phosphors don't do that. They have their own spikes.

I'm not asking for identical, just something vaguely similar.

It isnt even vaguely similar spectrum wise.

Adequate for a domestic situation, but that's all.

The current ones are pretty close. Double the number of LEDs or phosphors
and the graph would look pretty good.

Nope.

Yes, the graphs already look quite even.

All we have is cool white and warm white.

Wrong, as always.

Apart from some specialised ones perhaps.

Nothing specialised about the ones where you can
control the color temp because they can do 16M colors.

They're not very common.

Irrelevant to whether they are specialised or not.

That's what specialised means.

Never even heard of them until you mentioned them.

Sure, they havent been around all that long yet.

Seems to take ages for things to get sold in shops. I was buying LED bulbs on Ebay about 10 years before Asda sold them.

But most LED bulbs only have two whites.

Most can in fact do full RGB.

Only a few like yours.

There are heaps of them than can do full RGB

Clearly not as I've never even seen one, yet there are warm/cool whites available everywhere.

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