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2. Incandescent light bulb - Wikipedia

   en.wikipedia.org/wiki/Incandescent_light_bulb

   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) and a PAR 38 is 121 mm (4.75 in) in diameter. A package of four 60-watt light bulbs

3. Phase-out of incandescent light bulbs - Wikipedia

   en.wikipedia.org/wiki/Phase-out_of_incandescent...

   60 W incandescent light bulb with energy efficiency class E Equivalent 42 W halogen incandescent light bulb with efficiency class C Compact fluorescent lamp LED lamp. Various governments have passed legislation to phase out manufacturing or importation of incandescent light bulbs for general lighting in favor of more energy-efficient alternatives.

4. Centennial Light - Wikipedia

   en.wikipedia.org/wiki/Centennial_Light

   The bulb has received letters acknowledging and celebrating its longevity from the city of Shelby, Ohio, [20] the Alameda County Board of Supervisors, [21] the California State Assembly, [22] the California State Senate, [23] Congresswoman Ellen Tauscher, [24] Senator Barbara Boxer, [25] and President George W. Bush. [26] The bulb was featured ...

5. Tanning lamp - Wikipedia

   en.wikipedia.org/wiki/Tanning_lamp

   This example is a 71-inch, bi-pin, 100 watt model, the most common. Inside a preheat, bi-pin tanning lamp A high-pressure tanning lamp under power Tanning lamps (sometimes called tanning bulbs in the United States or tanning tubes in Europe) are the part of a tanning bed, booth or other tanning device which produces ultraviolet light used for ...

6. 3-way lamp - Wikipedia

   en.wikipedia.org/wiki/3-way_lamp

   The two filaments can be activated separately or together, giving three different amounts of light. One common 3-way incandescent bulb is the 50/100/150 W. It has a low-power 50 W filament and a medium-power 100 W filament. When they are both energized at the same time, 150 W of power is delivered, and a high level of light is produced.

7. Talk:Lumen (unit) - Wikipedia

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

   There is a tradeoff, though, between efficiency and bulb life. Standard ("general service") 100 W light bulbs are designed for bulb life in the 750–1000 hour range. Designing a bulb to run for this length of time at 230 V requires a cooler filament temperature, and therefore less efficiency.