Solatube® Performance
To determine an initial estimate of Solatube products required to daylight a space, use the relative light output specifications for the Solatube products as compared to the light output of the electrical lighting fixtures used in the space being daylit.
| PRODUCT |
RELATIVE LIGHT OUTPUT (LUMENS) |
ELECTRIC LAMP & FIXTURE |
21-O (21 in/530 mm
Daylighting System)
Open Ceiling
Solatube (b) |
13,900 Avg. Lumens (a)
Up to 20,800
(Solamaster Series) |
Approximately equal to the mean light output
of 0.6 - 400W High Bay Metal Halide Fixtures. (c) |
21-C (21 in/530 mm
Daylighting System)
Suspended/Hard
Ceiling Solatube (b) |
13,500 Avg. Lumens (b)
Up to 20,500
(SolaMaster Series) |
Approximately equal to usable light output
of 2 fixtures, each using (3) F032T8 fluorescent
lamps. (d) |
290 DS (14 in/350 mm
Daylighting System )
Solatube (a) |
6,000 Avg. Lumens (b)
Up to 9,100
(Brighten Up Series) |
Approximately equal to usable light output
of 1 fixture using (3) F032T8 fluorescent lamps. (d) |
160 DS (10 in/250 mm
Daylighting System )
Solatube (a) |
3,000 Avg. Lumens (b)
Up to 4,600
(Brighten Up Series) |
Approximately equal to (3) 18W quad-tube compact
fluorescent lamps. (d) |
|
| |
| a. |
Solatube relative light output based upon 30" (750mm)
tube run for the 21" (530mm) Open Ceiling SolaMaster
product. Maximum and average values achieved
over the peak 2,400 annual daylight hours for
San Diego, California TMY2 Weather Data. |
| b. |
Solatube relative light output based upon 6'
(1.829m) tube run for 10" (250mm) & 14" (350mm)
Brighten Up and 21" (530mm) Suspended Ceiling
SolaMaster products. Maximum and average values
achieved over the peak 2,400 annual daylight
hours for San Diego, California TMY2 Weather
Data |
| c. |
Assuming a typical high-bay fixture efficiency
of 90% and a mean lamp lumen output of 25,000
lumens. |
| d. |
Assuming a typical loss factor of 0.75, excluding
additional efficiency losses. |
|
To find light output for other areas, click here.
