R16 reflector LED at 5.5W and 400 lumens on an E26 medium base, in 3000K soft white and 5000K daylight — a 30W incandescent equivalent in a two-inch envelope.
The R number is the face diameter, and it is the whole specification. An R16 is stocked precisely because a BR20 or PAR20 will not fit the fixture, so diameter and base are stated before anything else.
A small line that prevents a lost sale on older accent and display fixtures. Incandescent equivalents remain in incandescent R & BR; step up in size to BR series.