Inside the smallest theatre light - the PAR16

ParCan - an abbreviation for Parabolic Aluminised Reflector bulb and the metal can it's housed in.

The bulbs used with these are MR16 or GU10. MR16 means Metallised Reflector and the 16 is its diameter in eighths of an inch. Likewise the classic PAR56 and PAR64 are 56 eighths (7 inches) and 64 eighths (8 inches) in diameter.

Even the first LEDs had the eighth of an inch sizing system. 3mm LEDs were called T1 and 5mm LEDs were called T1 3/4 (or T1.75). The same applies to fluorescent tubes - a T8 tube is 1" diameter, and a T4 tube is half an inch in diameter.

I think GU10 is named after its safety bayonet style base.

These little Par Cans, also known as birdies are commonly used in theatres and themed environments as a convenient way of getting a wash of light with a fairly concealed source.
The 12V versions often have inline electronic transformers, or a traditional chunky transformer mounted nearby.

These are a very common and cheap light to buy. This one came from CPC in the UK:-
https://cpc.farnell.com/pulse/par16-mv-bk/lantern-par-16-230v-black/dp/DP30408


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