This is accomplished through the use of roof-mounted Cycloptics reflectors using a 315 W ceramic
metal-halide lamp that produces 630 photosynthetic photon flux (PPF).
It is typical for a
metal-halide lamp to lose 40 percent or more of its light output over its life, whereas a T5HO lamp maintains over 95 percent of its initial light output as it ages.
It uses a solid-state power supply and a 50W
metal-halide lamp. Typical cure area is 0.5 in.
It provides increased initial light output and better-maintained lumens than a standard 400-watt pinched body
metal-halide lamp, while using the same amount of energy.
Incidentally, light pollution itself is becoming more broadband, as white
metal-halide lamps add to the mix of older sodium-and mercury-vapor lamps.
in Cleveland, which invented two
metal-halide lamps specifically for lighting the statue.