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Lumens per watt supplement
Robert Miehle listed some lumens per watt for a German manufacturer. I
supplement below with info from Philips Lighting, "Lamp Specification and
Application Guide." Note that we might care more about mean lumens per watt
or design lumens rather than initial lumens per watt. Also, there is much
variation among similar types of lamps even within Philips' inventory.
lamp watts initial lm/w mean lm/w
mean life hrs Other
MH 70 71 57
5,000
MH 100 85 68
10,000
MH 175 80 60
10,000
FL 20 63 55
9,000 warm white, T12
FL 20 54 48
9,000 daylight, T12
FL 20 30 25
9,000 agro-lite, T12
FL 20 67 63
9,000 ultralume, 5000k, T12
FL VHO 110 62 44
12,000 warm white, T-12
Greg. Tong
gtong at sirius_com
"Every infinity is composed of only two halves."