Question about making a long duty cycle laser

Hey guys, I am trying to make a longer duty cycle out of a C6 host with copper tapered heat sink, and a NDG7475 1w diode. At 1amp it's putting out 650mw, while at 800ma it's putting out 500mw roughly. I am thinking though for this little host 1amp is going to definitely be too much over longer periods of time. So at 800ma in a little C6 host should I get near continuous duty cycles without worrying about excessive heat? I mean it's rated for three times that current.

Appreciate any input, I'm new here!