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Solatube Performance Chart
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|
Product
|
Relative Light
Output (Lumens)
|
Electric Lamp
and Fixture
|
10" Solatube
(Max tube lenght
over 20 ft.) (6 m) |
3000 Lumensa
Up to 4600
|
Approximately equal to (3) 18W quad-tube compact fluorescent lamps. |
14" Solatube
(Max tube lenght
over 30 ft.) (9 m) |
6000 Lumensa
Up to 9100
|
Approximately equal to usable light output of 1 fixture using (3) F032T8 fluorescent lamps. |
21" Solatube
(Max tube lenght
over 40 ft.) (12 m) |
13 500 Lumensb
Up to 20 500
|
Approximately equal to usable light output of 2 fixtures, each using (3) F032T8 fluorescent lamps. |
a Solatube relative light output based upon 6-foot tube for 10" and 14" Brighten Up and 21" Suspended Ceiling SolaMaster products. Maximum and average values achieved over the peak 2400 annual hours for San Diego California TMY2 Weather Data.
b Assuming a typical light loss factor of 0.75, excluding additional fixture efficiency losses. |