
R5W Bulbs Explained: The 207 BA15s Sidelight Bulb, Its Base, and How to Replace It
An R5W bulb is a 5-watt single-filament bulb on a large single-contact BA15s bayonet base, used for sidelights, tail lights, number plate lamps, and interior

An R5W bulb is a 5-watt single-filament bulb on a large single-contact BA15s bayonet base, used for sidelights, tail lights, number plate lamps, and interior

A W16W bulb is a 16-watt single-filament capless bulb on a W2.1×9.5d wedge base, used for reversing lamps, high-level brake lamps, and bright marker lamps.

A halogen work lamp remains a viable purchase in 2026 where the lamp count is low, the use is occasional, and the unit cost matters