2 light bulbs in 1 fitting (double bulb holder)

with ceiling light fittings, you can still pump up the lumens with adapters such as this : double lampholder.
You can put 2 light bulbs in the same light fitting (don't go over the fitting or adapter maximum wattage).
Bought : TEMU £1.69 (Jan24)
I have seen variations of this : 3 bubs, 4 bulbs.
Ceiling light adaptations are very varied now.
e.g.
spaceship downlights (50w),
globe lights that fold out as 4 leaves,
5-in-1 lights that look like a rocket taking off.