Is R40 the Same as BR40? While R40 sounds similar to BR40, they are very different in design and application. The biggest difference between R, BR, and PAR flood light bulbs is the reflector which is the part of the bulb that reflects and distributes the light emitted.

Are R40 and BR40 bulbs interchangeable?

The difference between R40 and BR40 bulbs isn’t size (they’re the exact same in that department) but beam spread.

What does R40 bulb mean?

What are R/BR40 Bulbs? Reflector (R) or Bulged Reflector (BR) 40 bulbs have a reflective coating on the inside of the bulb that directs light forward. … Like all light bulbs, the 40 value represents the diameter of the bulb in 1⁄8 of an inch. Therefore, a R40 is 5 inches in diameter.