Solar Tubular Day Lighting System (TDLS)

• Reduces Cost of Artificial Electrical Lighting Energy for upto 10 hrs per day
• Reduced Maintenance costs of Electrical Lighting as no parts changes or cleaning involved
• Free & Renewable source of Energy
• Health & Well Being of employees and occupants
• Increases productivity & reduces stress of employees providing comfortable working environment

The Heschong Mahone Group, Inc., an organization that provides professional consulting services in the field of energy efficiency, found that office workers perform 6 to 12 percent faster when their indoor work environment offers exposure to daylight. Source link: Click

• Provides natural sunlight into building spaces without heat / glare
• Can be bent and made to travel within deeper building interiors (upto 12 meters)
• Can be fixed on roof top (metal/RCC) / side wall
• Can be fixed in areas with false ceiling
• Hemispherical rooftop collector does not allow dust to settle unlike conventional flat skylights
• Long life of minimum 12 years without any maintenance or recurring costs

• Light Collector: Mounted on Roof Top or Outer Wall and responsible for collecting sunlight and rejection of heat
• Light Transfer: Fixed between collector & diffuser and responsible for transporting light from collector until diffuser
• Light Diffuser: Controls and distributes light into the building interiors providing wider coverage

• Blocks UV & IR Radiation with UV / IR resistant Polycarbonate dome
• Able to collect low angle sunlight (Morning & Evening) with a 180° dome
• Mid noon Radiation is partially rejected with Light Deflection Plates placed inside Collector dome
• Impact resistant & clearly visible on rooftop
• Universal Galvalume metal flashing plate irrespective of metal roof profile

• Aluminum Reflective system
• Inner mirror surface provides multiple reflections of incoming light making light to travel down
• Static Air Column blocks heat transfer vide Conduction & Convection
• No change of light Color
• Minimal loss of transmission by aging
• Durable & Long life (min 20 years)
• Easy to assemble and install

• Transmission and Distribution of Light into the building interior
• Avoids Glare
• Human comfort to Daylight in indoors
• Made of Milky White Poly carbonate
• Available in various shapes based on the area of installation & application

ROOF SKYLIGHT	TUBULAR DAYLIGHT
Cannot capture low angle sunlight as roof skylights are flatly placed on roof	Dome shaped collector aids in low angle sunlight capturing
Low daylighting hours	Extended daylighting hours as result of low angle sunlight capturing
Bright spots as light falls directly below the skylight without any diffusion	Wider distribution on floor
Heat Buildup as there is no mechanism of heat rejection in conventional skylights	UV resistant collector dome rejects heat at light collection point and static air column further reduces transfer of heat into the building
Poor light dispersion and hence needs more quantity to cover a given area	Wider coverage on account of diffusion needing less quantity to cover given area
Poor light dispersion and hence needs more quantity to cover a given area	Wider coverage on account of diffusion needing less quantity to cover given area
Not applicable in areas of false ceiling	Can reach under false ceiling
Roof to Skylight ratio of 5% – 10%	Typical Roof to Skylight ratio of < 2%

The LEED * Green building rating system is a voluntary system where in the environmental performance of whole building is evaluated.

Tubular Day Lighting systems can impact the following categories:
Energy & Atmosphere-Reduction of design energy cost and energy performance optimization.

Size	Equivalent Electrical Wattage	Lumen Output	Electrical Savings	Area Coverage approx.
750 mm / 30 inches	475 W	22,000 lumens	1800kwhs	1000 ft2
530 mm / 21 inches	300 W	12,000 lumens	1100kwhs	500 ft2
400 mm / 16 inches	180 W	8,000 lumens	650kwhs	350 ft2
300 mm / 12 inches	90 W	4,000 lumens	320kwhs	150 ft2

Lumen output measured in clear sky condition of 1,00,000 ambient lux level

• For basement areas or multistoried buildings
• Areas where roof penetration not feasible
• Delivers sunlight into deeper building spaces

• Annual Electrical energy consumption for 400 watt Metal halide lamp for 24hrs cycle
• Annual Electrical energy consumption with Electrical light & equivalent Daylight
• Annual Electrical energy consumption with Electrical light, Daylight & controls

• Electrical energy consumption of 400w Metal halide lamp for 10hrs cycle
• Electrical energy consumption of 400w Metal halide lamp with equivalent Daylight
• Electrical energy consumption of 400w Metal halide lamp, Daylight & Controls

• Tubular Day Light systems can be equipped with optional dimmer arrangement – motorized control
  to dim the incoming daylight through tubes
• Because you don’t need 100% of the light 100% of the time, the innovative dimmer easily shuts off daylight entering a room with the convenience of a switch
• Typical Applications of Dimming: Areas of privacy, Conference rooms & Office areas

"Studies on Daylighting systems show that 30-50% more energy saving potential can be realized when Daylighting is fully integrated with Electrical lighting."

• Complete solution of controls for Electrical lighting to switch off when day light is available at preset lux levels
• Electrical lights can be simply switched on/off by Day light sensors depending on daylight provided in a space
• Removes human over-riding issue as lighting ON/OFF is completely automated based on the daylight received