As their name intimates, general purpose lamps (GLS), are just that. They are used for day-to-day practical lighting applications, such as in the home, office or factory where a simple light source is required.
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The higher wattage lamps are large in size and so too is the luminare; the larger lamps have now been replaced with halogen types and LED units.
GLS lamps come in a range of voltages from 12v to 250v and wattages from 25-500W, higher wattage lamps were available but have no been discontinued and superseded by halogen and other light sources.
This is the first lamp in my collection and is a 500w at 240v lamp, which is a large lamp as can be seen. I have only illuminated this a few times.
240v 300w lamp with a E40 Base
Philips 240v 200w Lamp with B22 Base
Nice old Mazda 240v 150w Tungsten Lamp with E27 Base
This lamp has two filaments of 50w and 100w enabling three levels of light output depending on how they are connected to the suppy, thus you have either 50w, 100w or 150w output, yhese tend to be used in the US.
STELLA 28v 60w Gas Filled Single Coil B22 Base, this lamp was used in an old train carriage
Sainsburys 240v 100w Coiled Coil B22 Base
210v 100w SEMA lamp (a make I currenty do not know) further research is required.