R10W signal bulb with BA15s base for parking, tail and licence-plate lights.
The NARVA R10W car bulb is a 12 V, 10 W signal lamp with a BA15s bayonet base — the standard fitment for parking, tail and licence-plate lighting on most cars and trailers. Each pack holds 2 bulbs, so you can replace both sides of the vehicle at the same time.
BA15s base for a direct factory-spec replacement
R10W is an ECE-standardised designation, so the bulb drops straight into the original socket with no rewiring or adapters. Typical uses include tail and parking lamps, licence-plate lighting and the marker lights of trailers and caravans.
Two bulbs per blister to replace the pair
Left and right lamps in the same position age at a similar rate, and changing them together keeps the brightness even on both sides. The second bulb also works well as a spare kept in the glovebox.