Technical

Lux Outputs

The amount of light produced by a SunPipe is quite variable, depending on sky conditions, whether it is cloudy or sunny, the time of day, the time of year, the length of the SunPipe, and the external conditions, whether there are trees, higher surrounding buildings, etc. The following chart, therefore is offered as guidance only as to a reasonable guide as to the maximum amount of light that is likely to be produced by a SunPipe on a typical flat roof application with a standard 600mm length of SunPipe, under steady state conditions.

The amount of light produced will also vary depending whether it is measured immediately below the diffuser, at floor level or at a midpoint. For the purpose of these charts, we have based the output that would be measured at a point of 1.5m below the diffuser level, that is at desk level of a typical room with a floor to ceiling height of 2.4m.

The light levels given are those that can be measured immediately below the diffuser at desk level and whereas the spread and distribution of natural light is extremely good, the light levels measured say 2m away will be somewhat less.

A more accurate lux plot of any room or area can be provided by SunPipe's Technical Department on request.

We have produced tables below showing three sets of values. The first table at 105k lux externally is the maximum value of light that could be expected in the UK under midday Summer conditions. The second table is probably the most typical being under Summer conditions, but under an overcast sky of 45k lux and is probably typical for a period of time from say, March through to October. The third table is for 20k lux externally, which is a typical Winter condition, under an overcast sky.

All the figures given are taking account of our new Super Silver SunPipe material. Our range of Diamond Domes are predicted to produce:-

Note: A 100w light bulb generates approximately 1000 lumens or 170lux.

...and the weather?