Festoon 42mm

You are buying one 42mm LED bulb with 6 high power wide angle chips.

This has a built in voltage regulator so it can operate from 8-30v and it will not damage the LED.
These are the brightest LED festoon bulbs available.
Ideal for use in galley and watch-keeper's all-night lighting for all applications where battery power is at a premium such as boats, yachts, buses, campers, caravans, RV's
It provides as much light as a 1 W filament bulb which uses 10 times as much power.
The LED bulb can be used in any lamp using a normal filament festoon bulb.

Just remove the old bulb and fit this one in its place.
LEDs are also cooler, more vibration resistant and extremely long-lasting.
Size 42mm
130 Lumens cool white
Up to 100,000 hours life
6x High power internal LEDs
8-30v
Built in voltage regulator