a 1000 watt MH or HPS should have a lumen output around 100,000 to 140,000. Using the inverse square law (Light output/distance from light source squared or L/D^2)to figure out light dispersal, you can see that a 1,000 watt bulb can effectively distribute 10,000 lumens (The Magic number) four feet from the bulb in all directions. Using a parabolic wing reflector increases this total area, as light that would normally go up is redirected down to the floor. It's not the number of plants necessarily but the size of your growing area. Without a decent reflector your limited to a 4x4 growing area. I use this formula to figure out where lights belong when designing buildings at my day job.
NugulousPrime Reviewed by NugulousPrime on . Quick Question bout lights? :rastasmoke:About how many plants should a person use per 1000w light ? Rating: 5