inquiry on the possibility of colored LED light simulation in Radiance

I just entered "spectral reflectance of leaves" into Google, and a whole
bunch of material popped out. It looks like there is actually a fair bit of
research on this.

···

--
Randolph M. Fritz, Lighting Design and Simulation
+1 206 659-8617 || [email protected]

On Thu, Nov 26, 2015 at 5:24 PM, alexander jiang < [email protected]> wrote:

Hi Greg,

Thanks for your info so much.

But I am still confused about what you mentioned in the previous email ‘can
characterize the reflectances of materials in each of these spectra,
probably through measurement”.

For instance, the green crops will be the objectives in the greenhouse
environment I plan to simulate, what specifically you mean ‘can
characterize the reflectances of materials through measurement”

Regards,

Alex

*From:* Greg Ward [mailto:[email protected]]
*Sent:* Thursday, 26 November 2015 8:53 AM
*To:* Radiance general discussion <[email protected]>
*Subject:* Re: [Radiance-general] inquiry on the possibility of colored
LED light simulation in Radiance

Hi Alex,

The RGB channels can represent any spectral content, so if you have 3 (or
fewer) illuminant spectra, and can characterize the reflectances of
materials in each of these spectra, probably through measurement, then you
can get accurate results from Radiance. If you have more than 3 spectra
you want to try, you can perform sequential runs accordingly. It's a bit
tedious, but people have done it.

Cheers,

-Greg

*From: *"alexander jiang" <[email protected]>

*Subject: *[Radiance-general] inquiry on the possibility of colored LED
light simulation in Radiance

*Date: *November 25, 2015 5:55:21 PM PST

Hi All,

Currently I was involved in a research on how different coloured LEDs and
the optimal intensities affect plant growth and qualities.

After reading through some info online, I know that it is okay with
simulating sunlight in Radiance but am not sure if it is possible to
simulate different coloured LEDs (such as red , blue, orange, etc)?

Regards,

Alex

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