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Although the design met its goals, it would have cost GE about $25 million to build new factories to produce the lamps, and thus the invention was shelved. [9] The design was eventually copied by others. [9] In 1980, Philips introduced its model SL*18, which was a screw-in or bayonet mount lamp with integral magnetic ballast. [10]
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. Ballasts for sign lighting in the United States, are ...
Ballast loss can be about 25% of the lamp power with magnetic ballasts, and around 10% with electronic ballasts. Fluorescent lamp efficacy is dependent on lamp temperature at the coldest part of the lamp. In T8 lamps this is in the center of the tube. In T5 lamps this is at the end of the tube with the text stamped on it. The ideal temperature ...
Ballast-swap replacement for 3 ft T12 30 W T8: 1.0, 25: 4: 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 ...
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.
In the US, ballasts for mercury-vapor lamps for general illumination, excluding specialty application mercury-vapor lamp ballasts, were banned after January 1, 2008. [18] 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 ...