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  2. Fluorescent-lamp formats - Wikipedia

    en.wikipedia.org/wiki/Fluorescent-lamp_formats

    32 F32T8: Ballast-swap replacement for 4 ft T12 40 W T8: 1.0, 25: 8: 59 F96T8: Ballast-swap replacement for 8 ft T12 75 W single-pin T12: 1.5, 38: 4 "25" F40UTSL Retrofit replacement for 4 ft T12 40 W on underpowered residential-grade rapid start magnetic ballasts. These are F40CW lamps made with lighter cathodes that can only handle a lower ...

  3. Fluorescent lamp - Wikipedia

    en.wikipedia.org/wiki/Fluorescent_lamp

    The efficacy of fluorescent tubes ranges from about 16 lumens per watt for a 4 watt tube with an ordinary ballast to over 100 lumens per watt [51] with a modern electronic ballast, commonly averaging 50 to 67 lm/W overall. [52]

  4. Electrical ballast - Wikipedia

    en.wikipedia.org/wiki/Electrical_ballast

    Several American magnetic ballasts for fluorescent lamps. The top is a rapid start series autoregulator ballast for two 30–40 W lamps. The middle is a preheat reactor ballast for a single 30–40 W lamp while the bottom ballast is a simple inductor used with a 15 W preheat lamp. An American magnetic ballast for signs in an aluminum sign frame.

  5. Luminous efficacy - Wikipedia

    en.wikipedia.org/wiki/Luminous_efficacy

    Fluorescent: 32 W T12 tube with magnetic ballast 60 [39] 9% 9–32 W compact fluorescent (with ballast) 46–75 [18] [40] [41] 8–11.45% [42] T8 tube with electronic ballast 80–100 [39] 12–15% PL-S 11 W U-tube, excluding ballast loss 82 [43] 12% T5 tube 70–104.2 [44] [45] 10–15.63% 70–150 W inductively-coupled electrodeless lighting ...

  6. 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 circa 2021. Various governments have passed legislation to phase out manufacturing or importation of incandescent light bulbs for general lighting in favor of more energy-efficient ...

  7. Compact fluorescent lamp - Wikipedia

    en.wikipedia.org/wiki/Compact_fluorescent_lamp

    Fluorescent lamps get dimmer over their lifetime, [35] so what starts out as an adequate luminosity may become inadequate. In one test by the U.S. Department of Energy, of Energy Star products in 2003–04, one quarter of tested CFLs no longer met their rated output after 40% of their rated service life. [36] [37]

  8. Glow switch starter - Wikipedia

    en.wikipedia.org/wiki/Glow_switch_starter

    A glow switch starter or glowbottle starter is a type of preheat starter used with a fluorescent lamp. It is commonly filled with neon gas or argon gas and typically contains a bimetallic strip and a stationary electrode. The operating principle is simple, when current is applied, the gas inside ionizes and heats a bimetallic strip which in ...

  9. Mercury-vapor lamp - Wikipedia

    en.wikipedia.org/wiki/Mercury-vapor_lamp

    In the US, ballasts for mercury-vapor lamps for general illumination, excluding specialty application mercury-vapor lamp ballasts, were banned after January 1, 2008. [19] Because of this, several manufacturers have begun selling replacement compact fluorescent (CFL) and light emitting diode (LED) bulbs for mercury-vapor fixtures, which do not ...

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