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Insulated Light Tube For Flat Roof – Lightway Solar tubes


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High performance insulated light tube for flat roof for sustainable and energy efficient homes. Offering certified U-values as low as 0.4 W/m²K. Suitable for flat felt, asphalt and membrane roofs.

The product is CE marked, meets BS EN ISO 14001 and BS EN ISO 9001.

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SKU: 0.05.SL.CFR-blue Categories: ,

Technical Details

Blue performance sun tunnel diagram

To suit an overall length (from top dome to diffuser) of 600mm.



  • Bohemia Crystal Dome

    1. Bohemia Crystal Glass Dome

    High quality 4 mm thick Bohemia Crystal glass dome with complete with brushed nylon condensation gasket. It collects 30% more sunlight than any other dome and lasts decades without any maintenance.

  • Flashing plate

    2. ABS Flashing Plate and Collar

    ABS (acrylonitrile-butadiene styrene) plastic Flashing plate which is corrosion resistant and suitable for felt, membrane and asphalt roof finishes. Supplied with an ABS collar for dome to fit on to.

  • Plain pipe

    3. 625mm Pipe Length

    The high quality 625mm aluminium tube with electroplated surface consisting of zinc, chrome and silver limits light diffusion to minimum.

  • Thermal Break

    4. Thermal Break

    High quality double glazed section which acts as a thermal break and ensures air tightness classifications. Made up of Two 4 mm thick glass panes and a 16mm Argon filled cavity. The unit is surrounded in 120mm extruded XPS Insulation

  • Ceiling extension

    5. 250 Ceiling Extension

    The high quality 250mm ceiling extension is manufactured from aluminium tube with electroplated surface consisting of zinc, chrome and silver. This provides a permanent joint between the diffuser and plain end pipe.

  • 6. Sodium-potassium Glass Diffuser

    The glass diffuser is designed to offer excellent thermal performance whilst ensuring maximum spread of natural daylight within the space and an even light distribution. The trim is supplied in white as standard.

  • Fixings

    7. Installation Pack

    The installation pack contains screws and fixings, brushed nylon condensation seal, aluminium tape and universal installation instructions.


The Lightway insulated light tube for flat roof Thermally Broken Crystal Sun Tunnel is a thermally broken, certified natural daylight system offering unique insulation capabilities which meet Passivhaus standards. The performance element within the reflective tube consists of two 4mm glass panes and an argon filled cavity. The complete tube is surrounded by extruded XPS thermal insulation. The Bohemia Crystal dome collect 30% more light than any other dome and the super reflective tube, which has a 25-year guarantee, is manufactured using advanced plasma plating technology. The tube is connected to a sodium-potassium glass ceiling diffuser for even distribution of light around the room. Sunlume Crystal Sun Tunnels are suited to almost any application, and have been installed anywhere from residential bedrooms to large shopping centres.

The SUNLUME PassivBlue crystal sun tunnel has been specifically developed to suit standard flat roof finish.


  • 230mm: 250mm Dia roof and ceiling opening required
  • 320mm: 350mm Dia roof and ceiling opening required
  • 520mm: 545mm Dia roof and ceiling opening required


  • Top Dome 4mm Bohemia Crystal glass
  • ABS plastic flashing plate and collar
  • Double Glazed Thermally Broken Section
  • Insulated with a U-value of 0.60 W/m²K
  • Superreflective real silver tube
  • 4mm glass ceiling diffuser.

Performance – Light Tube

  • 24mm Double Glazed Unit
  • Two panes of 4mm glass with 16mm argon filled cavity
  • U-value of 0.60 W/m²K or 0.41 W/m²K Triple Glazed
  • 120mm XPS Insulation

Crystal Glass Dome

 INSULATED SUN TUNNEL glass-skylight
Made of Bohemia Crystal glass dome collects 30% more light than any other skylight dome. This material is guaranteed not to change, discolour or degrate over time, no matter what weather conditions the dome is exposed to.

No maintenance is required as crystal glass domes are self-cleaning.

Photo on the right: Bohemia crystal glass dome (in the middle) and plastic domes after 5 years of wear under British weather conditions.

 INSULATED SUN TUNNEL Glass and Plastic Domes

Superreflective Tube vs Other Sun Pipes


Light Output Performance

DiameterLight OutputPerformance SunnyPerformance CloudyArea litEffective Length
156mm1000 lumens2 x 100w lightbulbs50w lightbulb3-4m2up to 3 m
230mm5220 lumens3 x 100w lightbulbs1.5 x 100w lightbulbs8m2up to 7 m
320mm15660 lumens5 x 100w lightbulbs3 x 100w lightbulbs12-15m2up to 12 m
520mm36540 lumens8 x 100w lightbulbs4 x 100w lightbulbs20-25m2up to 15 m

Thermal Break

Thermally broken sun tunnel

Additional information


230mm, 320mm, 520mm


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