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Coat LED streetlights yellow with phosphorous at Marine Drive, says IIT prof

Coat LED streetlights yellow with phosphorous at Marine Drive, says IIT prof

By BizLED Bureau

March 6, 2015: To install or not to install LED streetlights at Indian city Mumbai?s famous Marine Drive is a big debate in the political corridors of India. Amidst this debate, an IIT Bombay associate professor pointed out that human eye prefers yellow luminescence.

According to Dr Chetan Singh Solanki, of IIT’s Energy Science and Engineering department, since the yellow traditional incandescent lamps emit light that is like solar spectrum, human eyes are adjusted to be comfortable with traditional lights. However, he pointed out that these lights send light towards the sky, hence a lot of electricity get wasted.

Dr Solanki clarified that while he is a votary of LED technology, he suggests that with proper coating of phosphorous around LED lights, they can emit very close to yellow spectrum like old incandescent lights.

Dr Solanki said that the debate should be on the distribution of light and mounting of LEDs. ?It is important to design the distribution and angle of LED streetlights properly so that it give perfect light at perfect direction,? he said.

He refers to colour resolution index (CRI), that compares light spectrums and solar spectrum. “Today, good quality LED lights in the market have a CRI that is higher than that of domestic appliances like tube lights,” he said.

According to him, the dark spots that originated after LED streetlights were installed at Marine Drive is due to inefficient design and distribution of LED bulbs. He said that with the use of diffusers and proper mounting, the dark spots can be prevented.


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2 comments

  1. I agree. I find that blue white LED street lights are very harsh.There is a lot of information that shows that blue light affects night vision more .It also affects plants and animals more.

  2. Let us not agree without cogent evidence.

    Would like to see:
    1. Where, what is proposed, has been installed to show comparative effects?
    2. How the coating has been tested for life?
    3. Where has the prototype been tested for all parameters as per applicable BIS standards?
    4. What is the effect on lumens, energy efficiency, lux and lumen maintenance?

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