Originally Posted by Hoppy
This is based on my own measurements, using brand new GE CFL 6500K bulbs, in 8.5 inch diameter reflectors. Larger reflectors will give lower PAR and smaller will give higher PAR.
Based on the threads I've read here the 8.5 dome lamp seems to be much more popular then samller one.
Is that because the 8.5 inch dome will give you a wider light spread then a 5 inch at the same distance?