Reflectors only influence the side light, not touching the main beam so there's less light loss. They get a couple percent more light to the canopy than lenses.
the reflector has a tighter beam then the lens. although the reflector may give a slightly higher output..would not the lens give a better footprint at the cost of just slightly lower intensity
with the reflector beam angle narrower then the light would have to be raised slightly to compensate for footprint then in-fact lowering the intensity equalizing the 2? just wondering
I would rather have the extra output... but footprint is based on emitter height and spacing. These lamps have 10-12" emitter spacing and will provide consistent mixing at 12-16 inches.