Tubular Daylighting System with Vari Pitch Technology

Imagine an innovative system that harnesses sunlight and guides it indoors in a way that would be impossible with windows or skylights. Tubular Daylight System (TDS) which light up interiors of your buildings with natural sunlight which is energy efficient.

Integration of SunInside on the roof scores over FRP or polycarbonate daylighting / skylight sheets on the following points:

  • Safety of people working on the roof
  • Water leakage through installation


A dome shaped structure with specialized optical system that efficiently captures sunlight from multiple directions, collects and redirects it downward into the duct below. The collector ensures that the intensity of sunlight captured remains similar during morning, at noon and in the evening.


High Reflective Sheet provides minimum light loss and no colour shift (even in cloudy conditions). It has the highest visible reflectivity (photopic reflectivity >98%).


3MTM Diffuser Film enables uniform light spread and control in interior spaces. The unique lens design reduces glare and eliminates hot spots, and because of the optical-grade plastic used, the film does not alter the colours of the transmitted light.

Completed installations

SunInside500 Tubular guided daylighting system has been made in technical partnership with 3M India Ltd.

The daylight guidance system broadly consist of four different parts:

1. Collection System
Clear, UV resistant polycarbonate dome with flange
Parameter Specifications
Transmission Minimum 80%
Refractive Index 1.58
Service Temperature -10°C to 80°C
Thickness 2mm at flange
2. Guidance System
Aluminium Sheet Thickness: 0.4mm - 0.5mm
The film surface should have a luminous reflectivity of 98% and a bandwidth reflectivity of over 90% for 400 to 775nm wavelength of light incident between 0 to 80 degrees.
The mirrored surface shall be protected by a plastic sheet until final installation of the system.
2. Diffuser
Lens Diffuser made from UV stabilized polycarbonate film
Parameter Specifications
Diffuser type Lens
2. Roof Mounting System
Leak proof installation of the system on customer roof

The system is installed in such a way that the light guidance component of the system is airtight. This is necessary to prevent dust from entering the tube to ensure reflectivity is maintained. It is also to ensure that the air column inside the tube will act as an insulator for heat.

Daylighting system to be installed on variable-angle elbow to counter roof slope and to ensure daylight tube to remain perpendicular to ground. The complete assembly to be installed on FRP Base of profile which will match roofing sheet. All installation to be done by cutting hole on roof and placing FRP base above this hole.

Technical Specifications

Actual data may vary depending on climate conditions,cloud cover,etc.

Benefits of SunInside
  • Vari Pitch Technology
    Simple, quick and perpendicular installation to without any bends
  • Water Proof Installation
    Leakage free instalation procedure
  • Minimal Maintenance cost
    Does not contain any consumable replacement parts
  • Power factor
    Do not require any electricity to run
  • Purity plus
    Natural sunlight with the full visible spectrum
  • Health boost
    Upto 99% reduction in UV radiation. Sunlight is known to enhance productivity, well-being and mood
  • Green energy
    Eligible for LEED points
  • Bottom-line
    Tax benefits such as 80% depreciation can be claimed in first year
  • Cool tech
    Negligible heat transfer - lowers cooling requirement
Sun Inside for farther and brighter light
  • More efficient (minimizes the number of fixtures used)
  • Reduction of electrical energy bills effectively 10 hours a day
  • Payback period of 2 to 2.5 years
  • Negligible colour loss over longer length
Certificate Title