Solatube's proprietary extension tube material has a specular reflectance of over 99%, and is the most reflective material used in any tubular daylighting system.
Manufactured exclusively for Solatube Daylighting Systems, it is used on all reflective surfaces within the system.
Potential of heat, caused by Infrared wavelengths entering the tube, is removed from the harvested light before entering the building through the use of our patented Cool Tube technology incorporated in the tube material.
Spectralight Infinity Tubes deliver up to 99.7% specular reflectivity of visible light for maximum daylight transfer.
Spectralight Infinity Tubes allow for long tube runs, which can include 90 degree bends, to deliver consistent daylight to lower floors.
Included in each system kit are two tubes that attach to the flashing and ceiling diffuers, allowing for angles of up to 30 degrees.
Solatube extension tubes are available in straight 610mm sections that are designed to telescope together to give you exactly the required tube length between your roof and ceiling without the need for cutting.
Ideally, the shorter – and straighter – the tube the better the level of light transfer. Subject to application, we recommend a maximum effective tube length of up to 6 metres for the Solatube 160 DS (250mm diameter) and 9 metres for the Solatube 290 DS (350mm diameter).
Residential installation into a pitched roof, the tube would typically be around 1.5 - 2.0 m long and for a flat roof or vaulted ceiling installation with no extension tubes the tube distance can be as little as 150mm.
A 99.7% reflective material means that only 0.3% of energy (light) is lost each time light bounces inside the tube material — with 99.7% of the remaining light continuing on.
Therefore, if the light bounces down the tube 20 times to get from one end to the other, a huge 94.17% of the original light is transferred with Solatube's Spectralight Infinity tube material.
Solatube uses only rigid tubing in its daylighting systems. It is now widely recognised that flexible tube systems are very inefficient in transferring light, however it is important to understand that rigid tube materials can also vary considerably in their levels of light transmittance.
A seemingly small difference in the reflectivity level can result in a significant loss of light delivered into the room below. For example, a 98% reflective material would result in only 66.76% of the light being transferred after 20 bounces.
The longest Solatube in the UK is an amazing 24 metres long! Several of these commercial Solatube Daylighting Systems were installed in a government building in South Wales to deliver daylight into internal rooms.
We understand the longest system in the world is currently a Solatube Daylighting System installed in Italy which exceeds 26 metres in length. This system illuminates a dental practice in Milan — something to smile about!
To achieve optimal light output in spaces that require long tube runs, we recommend using tube lengths no longer than those listed below ...
Recommended maximum lengths ...