How much light will a Skytube give me?

To try to answer that question we have prepared a graph that shows lux levels obtained from a selection of common wattage electric lights and a Skytube on days with different amounts of sunshine. This gives you a means of judging whether a Skytube is the answer to your lighting needs by enabling you to compare its performance against a standard electric light.

Performance Graph

Performance Chart

Measurement Particulars:

Please note these points:

Measurements made at 5G Miro Place, Albany, Auckland, New Zealand
Room size 2.0m by 2.4m with a stud of 2.4m. The walls are painted light cream, ceiling white and the floor aqua.
Skytube 0.8m long, and has been installed for approximately 6 months.
Readings taken directly below the light source with an EMTEK LX - 101 light metre positioned 900mm above the floor.
Weather on the 20th August was overcast in the morning and sunny in the afternoon. While the 13th November was variably cloudy & clear.

These Lux readings are a measurement of light intensity not total luminance.
There is a difference in the spread pattern of light from a standard electric light suspended below the ceiling and that of a down light recessed into the ceiling. The pattern of light from a Skytube is more like that of a wide angle down light.
These readings are not intended for the comparison of performance of different tubular skylights as they are not under controlled conditions, nor are they a guarantee of performance in any particular installation.

Sellwood Products
Improving natural light within your home - natural, economic and environmentally friendly

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