cree emitters...

would the newer cree r5 emitters have generally better runtimes than the older r2 emitters? looking at some older user runtime sheets for various lights.

Do you mean The XP-G R5 versus the XR-E R2? Ot the XP-E R2 vs. the XP-G R5?

R2 and R5 are flux bins and are not the best way to identify an emitter. They're only useful in comparing the same emitter.

Let's assume you meam XP-G's all 'round.

What will affect your runtime is the current that the emitter is run at. A R5 and a R2 will both run just as long as the other, if they're driven at the same current. The R5, however, would be brighter.

If you were striving for exactly the same brightness, the you would run the R5 at a lower current than the R2, and you would have increased runtime.

Higher efficiency bins --> more light for same current

Higher efficiency bins--> more electrical energy gets turned into light, less wasted as heat



You can:

a) drive with less current ---> longer runtime, same brightness

b) drive with equal current ---> same runtime, more brightness

thanks for the replies. they answered my question perfectly...