Sorry to say this, but this reduce your available power, and burnin capacity too.
Sleds are not built for power, they're built for precision and focusing spot diameter ..... this means that all the elements inside contribute to this, but also take away lot of power ..... just as example, the diaphragm alone (the little plate wit the hole in front of the diode) take away half of the light, in the purpose to obtain a round beam shape ..... the cube, lenses and so on, made another good part ..... if you use the sled as is, you're probably lucky if you get 1/3 of the total power produced from the diode ..... and this being optimists