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2. Halogen lamp - Wikipedia

   en.wikipedia.org/wiki/Halogen_lamp

   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 ...

3. List of automotive light bulb types - Wikipedia

   en.wikipedia.org/wiki/List_of_automotive_light...

   WP3.3×14.5-4 1 12 V: 24 W Amber, ANSI № 7450 P27W W2.5×16d 1 12 V: 27 W ANSI № 3156 P27/7W W2.5×16q 2 12 V: 27 / 7 W ANSI № 3157 PR27/7W WU2.5x16 2 12 V: 27 / 7 W Red PY27/7W WX2.5x16q 2 12 V: 27 / 7 W Amber ANSI № 3757A R5W BA15s 1 6 V, 12 V, 24 V: 5 W Old designation: R19/5 RR5W BAW15s 1 12 V & 24 V: 5 W Red R10W BA15s 1

4. LED lamp - Wikipedia

   en.wikipedia.org/wiki/LED_lamp

   A 230-volt LED filament lamp, with an E27 base. The filaments are visible as the eight yellow vertical lines. An assortment of LED lamps commercially available in 2010: floodlight fixtures (left), reading light (center), household lamps (center right and bottom), and low-power accent light (right) applications An 80W Chips on board (COB) LED module from an industrial light luminaire, thermally ...

5. Incandescent light bulb - Wikipedia

   en.wikipedia.org/wiki/Incandescent_light_bulb

   Such a lamp may achieve up to 22 lumens per watt, compared with 17.5 for a 750-hour general service lamp. [77] Lamps of the same power rating but designed for different voltages have different luminous efficacy. For example, a 100-watt, 1000 hour, 120-volt lamp will produce about 17.1 lumens per watt.

6. List of Mullard–Philips vacuum tubes - Wikipedia

   en.wikipedia.org/wiki/List_of_Mullard–Philips...

   EL112 – 40 W AF/SW/VHF Radiation-cooled power pentode. EL152 or EL401 with a Y8A 8-pin steel tube base; EL136 – Horizontal-output power pentode for 110° deflection color TV; EL151 – Power pentode, Y10A steel tube 10-pin base; EL152 – 40 W AF/SW/VHF Radiation-cooled power pentode. EL112 or EL401 with a B10V glass 10-pin base with one ...

7. Luminous efficacy - Wikipedia

   en.wikipedia.org/wiki/Luminous_efficacy

   Luminous efficacy can be normalized by the maximum possible luminous efficacy to a dimensionless quantity called luminous efficiency.The distinction between efficacy and efficiency is not always carefully maintained in published sources, so it is not uncommon to see "efficiencies" expressed in lumens per watt, or "efficacies" expressed as a percentage.