ANSI Codes on Medium Bi-Pin Lamps
 
 
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ANSI Codes on Medium Bi-Pin Lamps

Would you be able to tell the difference between these lamps if they weren’t next to each other?
Various medium bi-pin lamps
All of these are medium bi-pin bases with the LCL (Light Center Length) in the same position so that one can use any of these lamps in the same instrument (assuming the unit is rated for the wattage). ANSI codes on medium bi-pin lamps