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6 V, 12 V, 24 V: 21 W ECE nominal luminous flux: 460lm ± 15% Old designation: P25-1 PR21W BAW15s 1 12 V & 24 V: 21 W Red PY21W BAU15s 1 12 V & 24 V: 21 W Amber ECE nominal luminous flux: 280 lm ±20% P21/4W BAZ15d 2 12 V & 24 V: 21 / 4 W PR21/4W BAU15d 2 12 V & 24 V: 21 / 4 W Red P21/5W BAY15d 2 6 V, 12 V, 24 V: 21 / 5 W
Halogen lamps made for 12 to 24 volt operation have good light outputs, and the very compact filaments are particularly beneficial for optical control (see picture). The ranges of multifaceted reflector "MR" lamps of 20–50 watts were originally conceived for the projection of 8 mm film, but are now widely used for display lighting and in the ...
In Europe, bulbs using wedge base connectors are often referred to by the designations the World Forum for Harmonization of Vehicle Regulations has assigned to them, like P27/7W for W2.5x16q when used as a combined 27 and 7 watt light bulb intended for position, brake and turn lights in vehicles.
The first phase will be followed by a ban on 60-watt-and-higher incandescent light bulbs starting in October 2014. By October 2016, all incandescent light bulbs will be banned in China. The final phase may be adjusted according to the results of interim assessment from October 2015 to October 2016.
By comparison, a 60-watt household incandescent lamp will produce about 900 lumens. The luminous efficacy or lumens produced per watt of input of flashlight bulbs varies over the approximate range of 8 to 22 lumens/watt, depending on the size of the bulb and the fill gas, with halogen-filled 12-volt lamps having the highest efficiency.
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 ...
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