Comments on: Cheaper LEDs From Silicon-based Nanoparticles?

By: Bob_Wallace

Bob_Wallace — Thu, 13 Jun 2013 22:39:00 +0000

And probably move to about 4000K at night.

You know, moonlight?

1500k only when we slay a bison….

By: sambar

sambar — Thu, 13 Jun 2013 22:26:00 +0000

Actually, life on earth has developed under a sun that emits a light of approx. 5600K at noon, and turns more red as we near sunset. Before the invention of artificial light the red hue would continue around the fire, and our bodies would relax and prepare for sleep. The most appropriate lighting would follow nature in changing color temperature through the day.

Goodnight.

By: JamesWimberley

JamesWimberley — Thu, 13 Jun 2013 15:00:00 +0000

I’ve said it before here: imitating sunlight is not the goal for lighting; it’s too hot – subjectively, cold. What we like is firelight, the black-body radiation from incandescent soot particles at 1500 Kelvin or so. The inefficient tungsten bulb, also black-body radiation, is a bit hotter than firelight but close enough for visual comfort, and far below sunlight.