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    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 and Fixture
    21-O (21 in/530 mm Daylighting System) Open Ceiling Solatube (b) (SolaMaster Series) 13,900 Avg. Lumens (a) Up to 20,800 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) (SolaMaster Series) 13,500 Avg. Lumens (b) Up to 20,500 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) (Brighten Up Series) 6,000 Avg. Lumens (b) Up to 9,100 Approximately equal to usable light output of 1 fixture using (3) F032T8 fluorescent lamps. or (5) 100 watt incandescent lamps. (d)
    160 DS (10 in/250 mm Daylighting System) Solatube (a) (Brighten Up Series) 3,000 Avg. Lumens (b) Up to 4,600 Approximately equal to (3) 18W quad-tube compact fluorescent lamps. (A standard 100 watt incandescent lamp produces 1200 lumens). (d)
    a. Solatube relative light output based upon 30" (750mm) tube run for the 21-O (21 in/530 mm Daylighting System) 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 160 DS (10 in/250 mm Daylighting System) & 290 DS (14 in/350 mm Daylighting System) and 21-C (21 in/530 mm Daylighting System) 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.

    Solatube FAQ

       
     
     

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