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  2. Fluorescent-lamp formats - Wikipedia

    en.wikipedia.org/wiki/Fluorescent-lamp_formats

    One of the first diameters of fluorescent lamps, with the 15W T8 and 30W T8 having been introduced in 1938. [3] The European energy-saving krypton T8 lamps were introduced by Thorn EMI during the 1970s. [4] The North American energy-saving argon T8 lamps weren't introduced until the 1980s. [5] T9 T29 1 + 1 ⁄ 8: 28.6 G10q quad-pin; G13 bi-pin ...

  3. T5 retrofit conversion - Wikipedia

    en.wikipedia.org/wiki/T5_retrofit_conversion

    T5 retrofit conversion is a means of converting light fittings designed to use T8 format lamps, so that they can use more energy-efficient T5 lamps. [1] This is done by electronically converting the luminaires to high frequency operation.

  4. Fluorescent lamp - Wikipedia

    en.wikipedia.org/wiki/Fluorescent_lamp

    T12 fluorescent tubes. The first two are rapid start, (for "tombstone" and socket holders respectively) while the third is an instant-start lamp. The instant-start has a characteristic, rounded, single pin, for plugging into the spring-loaded socket holders. Instant start fluorescent tubes were invented in 1944. Instant start simply uses a high ...

  5. T5 fluorescent lamp - Wikipedia

    en.wikipedia.org/?title=T5_fluorescent_lamp&...

    Language links are at the top of the page across from the title.

  6. Bi-pin lamp base - Wikipedia

    en.wikipedia.org/wiki/Bi-pin_lamp_base

    The suffix after the G indicates the pin spread; the G dates to the use of Glass for the original bulbs. GU usually also indicates that the lamp provides a mechanism for physical support by the luminaire: in some cases, each pin has a short section of larger diameter at the end (sometimes described as a "peg" rather than a "pin" [2]); the socket allows the bulb to lock into place by twisting ...

  7. 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 ...