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2. Luminous efficacy - Wikipedia

   en.wikipedia.org/wiki/Luminous_efficacy

   Luminous efficacy is a measure of how well a light source produces visible light. It is the ratio of luminous flux to power, measured in lumens per watt in the International System of Units (SI). Depending on context, the power can be either the radiant flux of the source's output, or it can be the total power (electric power, chemical energy ...

3. Lumen (unit) - Wikipedia

   en.wikipedia.org/wiki/Lumen_(unit)

   The lumen (symbol: lm) is the unit of luminous flux, a measure of the perceived power of visible light emitted by a source, in the International System of Units (SI). ). Luminous flux differs from power (radiant flux) in that radiant flux includes all electromagnetic waves emitted, while luminous flux is weighted according to a model (a "luminosity function") of the human eye's sensitivity to ...

4. Light-emitting diode physics - Wikipedia

   en.wikipedia.org/wiki/Light-emitting_diode_physics

   One of the key advantages of LED-based lighting sources is high luminous efficacy. White LEDs quickly matched and overtook the efficacy of standard incandescent lighting systems. In 2002, Lumileds made five-watt LEDs available with luminous efficacy of 18–22 lumens per watt (lm/W).

5. AMD: How Lighting Affects Your Vision - WebMD

   www.webmd.com/eye-health/macular-degeneration/...

   But it may be helpful to understand that a 60W bulb is roughly equivalent to a 15W CFL (compact fluorescent tube), an 8W LED (light emitting diode), and approximately 800 lumens (lumen is an ...

6. Lighting Your Workspace and Home When You Have Low Vision - WebMD

   www.webmd.com/eye-health/what-to-know-about...

   LED lighting: Light-emitting diodes are different than incandescent and fluorescent lights in the way they burn energy, and they also last much longer than other types of bulbs. LED lights are ...

7. LED lamp - Wikipedia

   en.wikipedia.org/wiki/LED_lamp

   LED lamp. A 230-volt LED lamp with an E27 base (10 watts, 806 lumens, 3000 Kelvins) Type. Light-emitting diode, light bulb. First production. 1968; 56 years ago (1968) A 230-volt LED filament lamp, with an E27 base. The filaments are visible as the eight yellow vertical lines. An assortment of LED lamps commercially available in 2010 ...