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Solarspot D-38 product
Solarspot D-38 lights up this kitchen in Buxton
Solarspot D-38 hallways

D-38 Specification

Diameter: 380mm (15″)
Max Recommended Length: 11m
Coverage: Up to 22sqm
Efficiency: 57%

Solarspot D-38 – giving you natural daylight.

The Solarspot D-38 is around 70% brighter than the next best solar tube system in the 300-400mm sector.

The 380mm diameter Solarspot D-38 is the brightest residential solar tube system in the world. But then we would say that wouldn’t we. Luckily you don’t have to take our word for it. Independent tests at both the UK’s Building Research Establishment and CSTB in France proof this beyond doubt, which is why we can say it.

Full range of Solarspot adjustable angles available.

Solarspot D-25 picture of through roof

Solarspot D-38, 380mm diameter Tubular Daylight System

This mid-size solar tube unit is designed for larger domestic situations and medium commercial installations. Independently tests prove the superior performance of the D-38 showing it to deliver around 70% more daylight than its nearest competitor in the 300-400mm diameter.

In the BRE tests of 2.2m sun tunnel systems the D-38 outperformed the Solatube 290 DS, delivering 69% more daylight. The D-38 is suitable from virtually every roof type and can be supplied with the full range of Solarspot accessories including adjustable angles up to 30, 60 or 90 degrees, as well as integrated light systems and dimmer units.

A Solarspot D-38 allows for large levels of daylight to be delivered, normally only achievable with much larger diameter units, into most standard building structures without the need for any structural alterations.

The Solarspot D-38 lights spaces up to 22sqm and is ideal for:
  • Larger corridors and hallways
  • Galleried landings and stairwells
  • Kitchens, Dining and living rooms
  • Workshops and smaller office space
  • Multiple use in larger office areas
Solarspot D-38 components:
  • Non-yellowing dome with RIR™ light capture lenses
  • Convas anti-condensation lens for increase thermal efficiency©
  • Extension tubes available: 200, 300, 400, 600 and 1200mm lengths
  • Flashings suitable for all virtually all roof types
  • Adjustable angle adaptors available: 0-30°, 0-60°, 0-90°
  • Range of circular and square diffusers available for solid and open-ceilings
Solarspot D-38 for Flat Roofs

Solarspot Flat Roof Systems

The Solarspot spun aluminium flashing makes it perfect for any flat roof application. The rigid strong, flashing is perfect for GRP or single-ply roofs, and heat-resistant for any hot-process membrane system.

The unit is also a great option for green roofs providing a more aesthetically sympathetic solution than a curb-mount option.

Solarspot D-38 pictures of roof flashing for pitched roofs

Solarspot Pitched Roof Systems

The Solarspot ABS flashing is available in either parallel or angled options to enable the perfect solution for any pitched roof.

The main flashing chassis can be heat-moulded to allow it to be formed over the profile of the roof tiles, and the sleeve adhesive flexible weathering-strip on the lower edge holds the flashing in-place, whatever the elements throw at it.

Solarspot – the world's brightest sun pipe

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Frequently Asked Questions

What should I look for when comparing product performance?

Independent, comparative testing using internationally recognised methodology – it’s as simple as that. And the thing to look out for is an efficiency figure. If a manufacturer is confident about the performance of their system they will quote an efficiency figure and then show how this compares to competitor products. Solarspot are the only manufacture of solar tube type systems to publicly publish these figures and that is because we know that, size-for-size, no one else will give you more daylight through a tube.

What does ‘efficiency’ mean, and how does it affect the light delivery?

Efficiency is a measure of the ability of the solar tube to deliver light from the top (dome) to the bottom (diffuser), regardless of the time of day or time or year. To suggest otherwise is like saying your car is faster on a Thursday or gives better MPG when there’s a ‘Y’ in the month. This is just a pile of bunkum put out by manufactures like Solatube trying to muddy the water. Read the independent BRE test summary of Solarspot D-38 and Solatube 290DS

Do I need a BBA certificate?

Unless you are a developer that wants to include the solar tube in the 10-year NHBC cover then the answer is no. For the vast majority of customers retro fitting into their homes, fitting in their own self-build project, retro fitting into an office as part of a refurb or a new commercial development, you don’t need a BBA certificate. The BBA certificate is no guarantee of performance. In fact the only other sun pipe to hold a BBA certificate was the Sola Skylights Skytunnel, the worst performing solar tube ever tested by the BRE. Read the BRE test summary of flexible sun pipes

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