Maybe in some application where red light is wanted without the relfected IR. I guess gallery or stage lighting where the excess IR is not desired but who lights a gallery with red flood lights.
Dichroic floods were much more common in the '70s. They were sort of a premium colored PAR38 flood that was used a lot commercially but I never saw them for sale in ordinary retail stores. They create colored light using a special filter (I'm not sure how they work). The face of the bulb is clear, but the filter somehow colors the light when it bounces off the reflector in the back. The resulting color is very pure and saturated - like what colored LEDs produce. I remember seeing these throughout Busch Gardens theme park in Williamsburg, VA about 10 years ago, but I am sure they have gone to LED by now. You can still find a few of these on eBay though they are expensive - about $30 apiece. They've always been very expensive.
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