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2. Guide number - Wikipedia

   en.wikipedia.org/wiki/Guide_number

   Accordingly, as illustrated at right, a guide number can be factored to a small f‑number times a long distance just as readily as a large f‑number times a short distance. Guide numbers are not an absolute measure of flash power (a property called luminous energy) because they are influenced by other variables, notably the camera's ISO ...

3. Lumen maintenance - Wikipedia

   en.wikipedia.org/wiki/Lumen_maintenance

   Lumen maintenance compares the amount of light produced from a light source or from a luminaire when it is brand new to the amount of light output at a specific time in the future. For instance, if a luminaire produced 1,000 lumens of light when it was brand new and now produces 700 lumens of light after 30,000 hours, then it would have lumen ...

4. Floodlight - Wikipedia

   en.wikipedia.org/wiki/Floodlight

   The most common type of floodlight was the metal-halide lamp, which emits a bright white light (typically 75–100 lumens/Watt). Sodium-vapor lamps are also commonly used for sporting events, as they have a very high lumen to watt ratio (typically 80–140 lumens/Watt), making them a cost-effective choice when certain lux levels must be provided. [4]

5. Luminous flux - Wikipedia

   en.wikipedia.org/wiki/Luminous_flux

   Table of comparative luminous flux of several light sources [7] [8] [9] Source Luminous flux (lumens) 37 mW "Superbright" white LED: 0.20 15 mW green laser (532 nm wavelength) 8.4 1 W high-output white LED: 25–120 Kerosene lantern: 100 40 W incandescent lamp at 230 volts: 325 7 W high-output white LED: 450 6 W COB filament LED lamp: 600 18 W ...

6. Cracker Barrel apologizes after refusing to serve students ...

   www.aol.com/cracker-barrel-apologizes-refusing...

   Cracker Barrel has apologized after its Waldorf, Maryland, restaurant refused to serve a group of students with special needs last week. The Lebanon, Tennessee-based restaurant chain said that its ...

7. Britney Spears Treats Herself to 'Fun Vacation' Getaway to ...

   www.aol.com/britney-spears-treats-herself-fun...

   Britney Spears is jet-setting for her 43rd birthday!. On Monday, Dec. 2, the global pop star set her sights on an international celebration for her big day. "Britney treated herself to a fun ...