We make an IR panel with about 100 LEDs in it. The LEDs are modulated with
three RF carriers (1.8MHz FSK, 2.3MHz FM, and 2.8MHz FM). The IR panel is
mounted on the back wall of a movie theater. The IR is reflected by the
screen at the other end (up to 30 meters away) and covers the auditorium.
We also allow for the use of slave panels. I suggest these be mounted at
the same location and just be used to get more IR power or to increase the
radiation angle. I have had people put panels in the four corners of a
room with coax between them. The delays in the coax result in the RF
modulation cancelling in some locations in the room. I visited one theater
that had trouble getting coverage in the middle of the room with four
panels. We put one at the back of the room and got rid of the problem.

In your situation, I see no problem with multiple LEDs to spread the
radiation angle. Further, since the modulating frequency is pretty low,
distance between them should not have any effect. You may be able to just
hang more LEDs in series (our panels have multiple series strings of LEDs
with each string driven by a current source).

Good luck!

Harold



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