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Amendment

Sodium Lamp Efficiencies

From the 15th November, 1938, the wattage ratings and efficiencies of Sodium Lamps have been declared by the E.L.M.A. as:

Watt Rating. Total Nominal Lumens. Initial Nominal Efficiency.
Lumens/Watt.		 Nominal Average Efficiency thoughout life
Lumens/Watt.
45 2500 55.5 42
60 3900 65.0 49
85 6100 71.5 57
140 10000 71.5 57

The slight alterations neccessitate correction of certain of the data included in those catalogue sheets relating to reflectors for Sodium Lamps. The amended data being as under:

Catalogue sheet of reflector group Rating of suitable lamp
OLD		 Rating of suitable lamp
NEW		 Gross wattage
Philora Rating
OLD		 Gross wattage
Philora Rating
NEW		 Total nominal lumens
OLD		 Total nominal lumens
NEW		 Initial Nominal Efficiency.
Lumens/Watt.		 Nominal Average Efficiency thoughout life
Lumens/Watt.
AL/2VS 50 45 60 67 2550 2500 55.5 42
AL/1HS 50 45 60 67 2550 2500 55.5 42
AL/2HS 70 60 80 82 3780 3900 65.0 49
AL/3HS 100 85 105 107 6100 6100 71.5 57
AL/3HS 150 140 160 167 9600 10000 71.5 57
B/3HS 150 140 160 167 9600 10000 71.5 57