Cleantech Snapshot – LEDs - India Renewable Energy Consulting – Solar, Biomass, Wind, Cleantech
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EAI presents Cleantech Snapshots: a quick summary of some of the most interesting and innovative areas in clean technology that will drive the sustainability movement in future.

This snapshot focuses on Light Emitting Diode. Within this page you will find


  • A light-emitting diode (LED) is a semiconductor light source. LEDs are used as indicator lamps in many devices, and are increasingly used for lighting
  • LEDs are becoming commonplace at a fast rate. And it is good news, as they bring about significant energy savings with longer lives, without attendant problems present in technologies like CFL
  • The high upfront cost of LED is still a pain point preventing their quick adoption. This should hopefully reduce significantly over the next 5 years, at which point LEDs will experience an explosive growth in adoption

Green AviationLight Emitting Diode(Image source


Working of LED

  • The electrons within the diodeare excited when the LED is connected to an electrical current, making them release photons, which we see as light
  • The color of the light is a direct result of the energy gap in the semiconductor of the diode
  • This means that LEDs produce a spectrum of colors easily and brightly while using very little electricity to do so
  • When an LED unit is activated, AC voltage is converted into sufficient DC voltage, which is applied across the diode semiconductor crystal
  • The LED is sealed in a clear or diffuse plastic lens that can provide a range of angular distributions of the light

EAI’s Consulting Division provides special assistance for entrepreneurs/businesses interested in exploring opportunities in the sustainable and eco-lighting domain. See here for more.


  • Miniature
  • Mid-range
  • High-power
  • Application-specific variations


  • Energy efficiency
  • Long lifetime
  • No warm-up period
  • Not affected by cold temperatures
  • Directional
  • Excellent color rendering
  • Environment friendly
  • Controllable – LEDs can be controlled for brightness and color


  • Indicators and signs
  • Smart and sustainable lighting
  • Used extensively in Optical fibre and free space optics
  • Grow lights useLEDs to increase photosynthesis in plants
  • LEDs are an essential part of the illumination system in digital microscopes, such as those which can be directly attached to the USB port of a computer

See also: an interesting emerging cleantech segment – Building Energy Analytics

About Narasimhan Santhanam (Narsi)

Narsi, a Director at EAI, Co-founded one of India's first climate tech consulting firm in 2008.

Since then, he has assisted over 250 Indian and International firms, across many climate tech domain Solar, Bio-energy, Green hydrogen, E-Mobility, Green Chemicals.

Narsi works closely with senior and top management corporates and helps then devise strategy and go-to-market plans to benefit from the fast growing Indian Climate tech market.

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