The spread of the h80 is a bit wasted in my small area so I made "optics" for it.
Took a 1" section of 1" PVC which is the stock optics opening and tested using the PVC to limit the spread. 1/2" and 1" and like the tighter 1" patten. I then put shiny side aluminum foil on the inside of the PVC tube to possibly act as a reflector and then used strong automotive double sided tape to stick the PVC to the light. I didn't want to use super glue for that since it's hard to remove.
Looks like does a great job limiting light spill in the small sump and I wouldn't be surprised if there is more PAR from my "reflector" straight under the light although that wasn't my goal, just limit overspill.
Took a 1" section of 1" PVC which is the stock optics opening and tested using the PVC to limit the spread. 1/2" and 1" and like the tighter 1" patten. I then put shiny side aluminum foil on the inside of the PVC tube to possibly act as a reflector and then used strong automotive double sided tape to stick the PVC to the light. I didn't want to use super glue for that since it's hard to remove.
Looks like does a great job limiting light spill in the small sump and I wouldn't be surprised if there is more PAR from my "reflector" straight under the light although that wasn't my goal, just limit overspill.