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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."