Lumens Per Watt (LPW)
The ratio of light energy output (Lumens) to electrical energy input (Watts).
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Lumen
Standard unit of measure for light flux or light energy. Lamp light output is measured in Lumens.
LPW
Lumens Per Watt
Long-Term Stability
The stability over a period of one year.
Long Distribution (Lighting)
A luminary is classified as having a long light distribution when its max candlepower point falls between 3.75MH 6.0MH TRL. The maximum luminaire spacing-to-mounting height ratio is generally 12.0 or less.