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They will function as a standard 40 W lamp on full-power ballasts, but may not last as long. These lamps are typically rated to last for 12,000 hours on a residential-grade ballast and only 6000 hours on a commercial-grade one. T12 1.5, 38 4 32 F40T12/ESP Retrofit replacement for 4 ft T12 40 W T12 1.5, 38 4 34 F34T12 F40T12/ES
[32]: 20 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] Ballast loss can be about 25% of the lamp power with magnetic ballasts, and around 10% with electronic ballasts.
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.
8.5–11.4% Ultra-high-pressure (UHP) mercury-vapor arc lamp, with reflector for projectors: 30–50 [38] 4.4–7.3% 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 ...
Though not as energy efficient as other alternatives, they are up to 40 percent more efficient than standard incandescent lamps designed for a 2000-hour life. [12] Depending on size, voltage, and designed life, small, low-voltage halogen lamps can have 70% higher efficacy than large, line-voltage lamps.
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]
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