luminaire efficiency การใช้

Plasma lamps typically have luminaire efficiencies exceeding 90 %.
High intensity discharge lamps have typical luminaire efficiencies of 55 %, and fluorescent lamps of 70 %.
The " system efficiency " for a High Efficiency Plasma lamp is given by the last three variables, that is, it excludes the luminaire efficiency.
Many modern plasma lamps, such as those manufactured by Ceravision and Luxim, have very small light sources far smaller than HID bulbs or fluorescent tubes leading to much higher luminaire efficiencies also.
However, full cutoff fixtures may also trap more light in the fixture than other types of luminaires, corresponding to lower luminaire efficiency, suggesting a re-design of some luminaires may be necessary.