[Radiance-general] Modeling glare from light fixtures

[Thomas Bleicher]

On Mon, May 16, 2011 at 10:24 AM, Randolph M. Fritz <RFritz at lbl.gov> wrote:

> I wonder if HDR images of an LED fixture would provide a useful basis for
> glare calculation.
>

If you have a simple fitting where the LEDs have individual lenses and no
common reflector you can approximate the appearance with the data from the
IES file: Instead of one (box-shaped) luminaire you model each LED as a disc
(size of lens) and apply the IES file to each LED. Then you have to increase
the output of the LEDs to compensate for the loss in area of the luminous
opening (large rectangle vs small discs). This can be a fairly good
approximation for the high intensity of LEDs.

Regards,
Thomas
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