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2. Street lighting in Washington, D.C. - Wikipedia

   en.wikipedia.org/wiki/Street_lighting_in...

   The 16 and 18 poles have a 24-inch (61 cm) base, a 15-inch (38 cm) bolt circle, and accommodate a 70-400 watt lamp. The 14 pole has a 17-inch (43 cm) base, a 10.5-inch (27 cm) bolt circle, and accommodate a 70-150 watt lamp. The 716 pole has an octagonal 24-inch (61 cm) base, a 9.5-inch (24 cm) bolt circle, and accommodate a 70-400 watt lamp.

3. Lightbulb socket - Wikipedia

   en.wikipedia.org/wiki/Lightbulb_socket

   GU5.3, GX5.3, GY5.3, GZ5.3 – same as G5.3 and only denote what lamp mount clip is needed to hold the actual light bulb in place; G6.35 – 6.35 mm (0.25 in)spacing GY6.35 & GZ6.35 – same as G6.35 and only denote what lamp mount clip is needed to hold the actual light bulb in place; G8 – 8 mm (0.31496 in) pin spacing

4. Fluorescent-lamp formats - Wikipedia

   en.wikipedia.org/wiki/Fluorescent-lamp_formats

   In the United States and Canada, lamps are typically identified by a code such as FxxTyy, where F is for fluorescent, and the first number (xx) indicates either the power in watts for bi-pin lamps, length in inches for single-pin and high-output lamps, and for circular bulbs, the diameter of the circular bulb.

5. Edison screw - Wikipedia

   en.wikipedia.org/wiki/Edison_screw

   Unlike bayonet sockets, three-way and regular lamps are interchangeable, although the low filament or low setting does not work if mismatched. The small Edison screw has nine threads per inch, or a pitch of 1 ⁄ 9 in or 2.8222 mm per thread. The medium Edison screw has seven threads per inch, or a pitch of 1 ⁄ 7 in or 3.

6. 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 ...

7. Street light - Wikipedia

   en.wikipedia.org/wiki/Street_light

   A street light, light pole, lamp pole, lamppost, streetlamp, light standard, or lamp standard is a raised source of light on the edge of a road or path. Similar lights may be found on a railway platform .