Here are mine....they're DOT approved so they must be bright enough....
Lights On (LED on Right)
Brakes (LED on right)
Comparison (Normal Left, LED right)
Close up of LED
Theres not too much difference directly behind, but the leds are more focused, overall light output seems similar.
They do make more expensive Leds that have side mounted leds to disperse light more into the reflector but they're generally not needed for Leds as they are focused internally. But here the stock reflector still reflects some light.