I have another idea
build a box that works kinda like a huge periscope with 1 mirror and can shine just the reflected light down at the plants. it could take adventage of all the lumens at just one spot. maybe just use it for flourescent lights.
another idea would be a spinoff of the reflector idea make it so the light reflects down from the sides at a farther distance so you wouldnt need a light mover
possibly try with mylar reflectors as well and do side by side comparisons

the reflector in my teklight is more like a curved mirror than mylar

I could be totally wrong about this but who knows
without experimentation we will never find out