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Choosing a White LED

AmyPrattis has not written a bio yet…


January 26, 2016 16:07

Is there any value (or studies) in specifying a high (80+) R13 value for outdoor streetscape lighting projects?

Because of facial better color benefits in specifying a high R13 value does the pedestrian feel:

- better comfort in window shopping?
- better safety factor because facial features are better seen?
- a more inviting environment therefore promoting shopping in that space?
- a better uniformity? Is yes, does that constitute lower FC requirements?

As a separate subject:

Is there any truth to lowering the blue band width (4 - 6K CCT) that there will be less light trespass therefore constituting 2700 K to 3000 K designs being prudent?

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August 25, 2015 02:30

Dear Amy:
Measuring white light in terms of temperature comes from the black body radiation theory.
There are really no white LEDs. The Nobel Prize was given to the inventors of the blue LED.
Blue LEDs plus a luminescent phosphorus mixture which adds red a green light from a part of the blue, creates the white light.
Actually white is a human concept of our perception. Exact color rendering is impossible using 3 chromatic systems and that is well known fact since color printing and color TV.

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August 24, 2015 10:23

Interesting overview and thank you for introducing me to the remote phosphor lens, I was completely unaware of these!

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