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  2. Unnat Jyoti by Affordable LEDs for All - Wikipedia

    en.wikipedia.org/wiki/Unnat_Jyoti_by_Affordable...

    Unnat Jyoti by Affordable LEDs for All (UJALA) [2] was a project to distribute efficient LED lighting, launched by Prime Minister of India Narendra Modi on 5 Jan 2015. [3] [4] The project is spearheaded by the Energy Efficiency Services Limited. [5] In non-subsidized LED lamp distribution projects, this program is considered the world's largest.

  3. LED lamp - Wikipedia

    en.wikipedia.org/wiki/LED_lamp

    In 2016 Government of India launched 'Ujala LED bulb scheme' to lower India's carbon footprint and save electricity, it distributed 370 million LED bulbs free, by doing so as of March 2022, which resulted in saving of ₹ 200 billion (US$2.3 billion) of middle class and poor household power bill. The scheme is intended to replace all the ...

  4. Luminous efficacy - Wikipedia

    en.wikipedia.org/wiki/Luminous_efficacy

    Sources that depend on thermal emission from a solid filament, such as incandescent light bulbs, tend to have low overall efficacy because, as explained by Donald L. Klipstein, "An ideal thermal radiator produces visible light most efficiently at temperatures around 6300 °C (6600 K or 11,500 °F). Even at this high temperature, a lot of the ...

  5. Surya Roshni - Wikipedia

    en.wikipedia.org/wiki/Surya_Roshni

    Surya Roshni Limited (formerly Prakash Surya Roshni Limited) is an Indian multinational company headquartered in Delhi that produces fans, [4] steel, lighting, LED, [5] [6] kitchen appliances [7] and PVC pipes. Surya exports its products over 44 countries [8] and is one of the top manufacturers of LED lights in India. [9]

  6. Incandescent light bulb - Wikipedia

    en.wikipedia.org/wiki/Incandescent_light_bulb

    Study of the problem of bulb blackening led to the discovery of thermionic emission, the invention of the vacuum tube, and evaporation deposition used to make mirrors and other optical coatings. [123] [124] [125] A very small amount of water vapor inside a light bulb can significantly increase lamp darkening.

  7. Light-emitting diode - Wikipedia

    en.wikipedia.org/wiki/Light-emitting_diode

    As of 2011, some LED bulbs provide up to 150 lm/W and even inexpensive low-end models typically exceed 50 lm/W, so that a 6-watt LED could achieve the same results as a standard 40-watt incandescent bulb. The lower heat output of LEDs also reduces demand on air conditioning systems.

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