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2. List of automotive light bulb types - Wikipedia

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

   Cap (Base) Filaments Nominal power Comments Image PC194 T10 (if removable) or fixed to holder 1 14 V / 3.78W Used on circuit boards for e.g. dash lights, gauge cluster backlights. Similar in size to W3W if with a T10 base. PC74 T1-3/4 (if removable) or fixed to holder [9] 1 14 V / 1.4W Used on circuit boards for e.g. dash lights, gauge cluster ...

3. 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 ...

4. Headlamp - Wikipedia

   en.wikipedia.org/wiki/Headlamp

   H4 bulb H7 bulb The first dual-filament halogen bulb to produce both a low and a high beam, the H4 (60/55 W @ 12 V, 1650/1000 lm ±15% @ 13.2 V), [ 94 ] was released in 1971 [ 13 ] and quickly became the predominant headlamp bulb throughout the world except in the United States, where the H4 is still not legal for automotive use.

5. Wedge base - Wikipedia

   en.wikipedia.org/wiki/Wedge_base

   However, each manufacturer has a slightly different type of wedge base differing in exact dimensions (or even hexagonal instead of round), so the plastic bases often need to be swapped when replacing bulbs. (The wedge bases are now usually not even supplied with the bulbs, which cost nearly as much as buying a new set, typically 10 bulbs for a ...

6. Fluorescent-lamp formats - Wikipedia

   en.wikipedia.org/wiki/Fluorescent-lamp_formats

   Fluorescent lamps in various embodiments. Since their introduction as a commercial product in 1939, many different types of fluorescent lamp have been introduced. Systematic nomenclature identifies mass-market lamps as to overall shape, power rating, length, color, and other electrical and illuminating characteristics.

7. Halogen lamp - Wikipedia

   en.wikipedia.org/wiki/Halogen_lamp

   The small size of halogen lamps permits their use in compact optical systems for projectors and illumination. The small glass envelope may be enclosed in a much larger outer glass bulb, which has a lower temperature, protects the inner bulb from contamination, and makes the bulb mechanically more similar to a conventional lamp. [1]