identify your lightbulb > bulb identification key


STEP ???: Un-tipped, Clear Bulbs


Select the option most resembling your bulb from the drop-down menu to proceed to the next step. Please consult "option descriptions" for detailed info.


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FULL OPTION DESCRIPTIONS / IMAGE GLOSSARY: [Option titles are also linked to proceed to the next step.]

Bulb is un-tipped, clear (or transparent) and has one of three filament configuration (Note: See Figure 6 (A43) ) to distinguish a single-coiled filament from a double-coiled filament.


OPTION A: 510a – (Figure 72f, Thumbnail) – “Lamp has single long metallic filament with round cross section.  Filament is metallic in appearance and threaded numerous times between two levels of several wire supports attached radially around the upper and lower portions of the button rod (about 3 to 4 at both top and bottom).  This is a drawn tungsten lamp.”  Go to A30- Figure 201.


 
OPTION B: 510b – (Figures 203f and 204f and 205f, Thumbnail)  “Lamp has short single-coiled filament about one inch long and metallic in appearance. Coil could be mounted horizontally either straight or in a semi-circular fashion on the two lead wires (bi-post mounting) and two or more wire supports attached to the shank, stem press, or button rod.  Or coil could be mounted vertically from one longer lead-in wire to the shorter lead-in wire.  This is a single-coiled tungsten filament light bulb.”  Go to A31 - Figures 203 and 204.


OPTION C: 510c –  (Figure 205f, Thumbnail)   “Lamp has short coiled-coil (or double-coiled) filament about one inch long and metallic in appearance. Coil could be mounted horizontally either straight or in a semi-circular fashion on the two lead wires (bi-post mounting) and two or more wire supports attached to the shank, stem press, or button rod.  Or coil could be mounted vertically from one longer lead-in wire to the shorter lead-in wire.  This is a double coiled tungsten filament light bulb.” Go to A32 - Figure 205.


OPTION D: 510d – (Figure 215 - No photo available) “The lamp has two coiled filaments, both metallic in appearance. Coils can be mounted in any number of configurations, including horizontally or vertically, as long as there are two separate filaments.  This is a three-watt lamp (not a lamp with a rating of 3 watts) also known as a three-way lamp.  Top of bulb may have lamp rated with three different wattages.”  Go to A33 – Figure 215.




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