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2. Parabolic aluminized reflector - Wikipedia

   en.wikipedia.org/wiki/Parabolic_aluminized_reflector

   For example, a PAR16 lamp is approximately 2 inches or 50.8 mm in diameter. [1] The size of rectangular PAR lamps is expressed as the letters REC followed by the reflector's mouth height, the letter "X", and the reflector's mouth width—with both dimensions in millimeters. For example, REC142X200 lamps are 142 high and 200 mm wide. [2] [3]

3. List of 50 kW AM radio stations in the United States

   en.wikipedia.org/wiki/List_of_50_kW_AM_radio...

   The following is a list of radio stations in the United States that are authorized to run 50 kW (50,000 watts) of power. This is the highest power authorized to any AM station in the United States. Power Legend: U=unlimited time, D=daytime power, N=nighttime power, CH= critical hours power.

4. Photosynthetically active radiation - Wikipedia

   en.wikipedia.org/wiki/Photosynthetically_active...

   Photosynthetically active radiation (PAR) spans the visible light portion of the electromagnetic spectrum from 400 to 700 nanometers. Photosynthetically active radiation (PAR) designates the spectral range (wave band) of solar radiation from 400 to 700 nanometers that photosynthetic organisms are able to use in the process of photosynthesis.

5. Incandescent light bulb - Wikipedia

   en.wikipedia.org/wiki/Incandescent_light_bulb

   120 V sizes: PAR 16, 20, 30, 38, 56 and 64 230 V sizes: PAR 16, 20, 30, 38, 56 and 64 Available in numerous spot and flood beam spreads. Like all light bulbs, the number represents the diameter of the bulb in 1 ⁄ 8 of an inch. Therefore, a PAR 16 is 51 mm (2 in) in diameter, a PAR 20 is 64 mm (2.5 in) in diameter, PAR 30 is 95 mm (3.75 in ...

6. Luminous efficacy - Wikipedia

   en.wikipedia.org/wiki/Luminous_efficacy

   Luminous efficacy can be normalized by the maximum possible luminous efficacy to a dimensionless quantity called luminous efficiency.The distinction between efficacy and efficiency is not always carefully maintained in published sources, so it is not uncommon to see "efficiencies" expressed in lumens per watt, or "efficacies" expressed as a percentage.

7. Kristin Davis Beat Hilary Swank for “Melrose Place” Role ...

   www.aol.com/kristin-davis-beat-hilary-swank...

   Kristin Davis went head-to-head with Hilary Swank for her iconic role on Melrose Place.. In PEOPLE's latest cover story, the actress, 59, takes a walk down memory lane as she reflects on her long ...