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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. Halogen lamp - Wikipedia

   en.wikipedia.org/wiki/Halogen_lamp

   A halogen lamp (also called tungsten halogen, quartz-halogen, and quartz iodine lamp) is an incandescent lamp consisting of a tungsten filament sealed in a compact transparent envelope that is filled with a mixture of an inert gas and a small amount of a halogen, such as iodine or bromine. The combination of the halogen gas and the tungsten ...

4. 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 ...

5. Color rendering index - Wikipedia

   en.wikipedia.org/wiki/Color_rendering_index

   Color rendering index shown as color accuracy. A color rendering index (CRI) is a quantitative measure of the ability of a light source to reveal the colors of various objects faithfully in comparison with a natural or standard light source. Color rendering, as defined by the International Commission on Illumination (CIE), is the effect of an ...

6. Luminous flux - Wikipedia

   en.wikipedia.org/wiki/Luminous_flux

   Luminous flux (in lumens) is a measure of the total amount of light a lamp puts out. The luminous intensity (in candelas) is a measure of how bright the beam in a particular direction is. If a lamp has a 1 lumen bulb and the optics of the lamp are set up to focus the light evenly into a 1 steradian beam, then the beam would have a luminous ...

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

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

   Halogen bulbs that give off heat: Be careful with halogen or "tungsten-halogen" bulbs. These bulbs can be a good option for someone with low vision because they are very bright, create contrast ...