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2. Holiday lighting technology - Wikipedia

   en.wikipedia.org/wiki/Holiday_lighting_technology

   Early bulbs, as well as some new antique reproductions, are made in various shapes and then painted like Christmas ornaments. Bubble lights and twinkle bulbs also come in this size. Outdoor-only bulbs are designated C 9 + 1 ⁄ 4 (1 + 5 ⁄ 32 in, or 29 mm), and have a similar blunt shape as the C 7 + 1 ⁄ 2, but use an E17 "intermediate" base ...

3. Incandescent light bulb - Wikipedia

   en.wikipedia.org/wiki/Incandescent_light_bulb

   Light bulbs using coiled coil filaments are sometimes referred to as 'double-coil bulbs'. For a 60-watt 120-volt lamp, the uncoiled length of the tungsten filament is usually 580 millimetres (22.8 in), [76] and the filament diameter is 0.046 millimetres (0.0018 in). The advantage of the coiled coil is that evaporation of the tungsten filament ...

4. Phase-out of incandescent light bulbs - Wikipedia

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

   Objections to replacement of incandescent lamps for general lighting mainly include the higher purchasing expense of alternative light bulbs. To mitigate the cost effects of these concerns, various programs have been put into place, ranging from subsidies for lamps, to improved standards for measurement of performance and for labeling of products.

5. AN/PEQ-16 - Wikipedia

   en.wikipedia.org/wiki/AN/PEQ-16

   1× CR123A 3-Volt battery 2× CR123A 3-Volt batteries Battery Life >6 hours (in Dual High DH setting) 4 hours Normal operation (≥ 30 mins of continuous white light use) Waterproof 6 m (20 ft) for 1 hour 6 m (20 ft) for 1 hour Visible Laser Class IIIR IIIR Output 5.0 mW 4.0 mW Divergence 0.5 mrad 0.5 mrad Wavelength Red (635 ± 15 nm)

6. Compact fluorescent lamp - Wikipedia

   en.wikipedia.org/wiki/Compact_fluorescent_lamp

   Most CFLs contain 3–5 mg per bulb, with the bulbs labeled "eco-friendly" containing as little as 1 mg. [81] [82] Because mercury is poisonous, even these small amounts are a concern for landfills and waste incinerators where the mercury from lamps may be released and contribute to air and water pollution.

7. Neon lamp - Wikipedia

   en.wikipedia.org/wiki/Neon_lamp

   A General Electric NE-34 glow lamp, manufactured circa 1930. Neon was discovered in 1898 by William Ramsay and Morris Travers.The characteristic, brilliant red color that is emitted by gaseous neon when excited electrically was noted immediately; Travers later wrote, "the blaze of crimson light from the tube told its own story and was a sight to dwell upon and never forget."