Here is a small scale test
Brand new Ledil 90*= 792µmols
2+ month old ledil after cleaning= 776µmols
New Ledil with brand new diffuser lens 728µmols
New Ledil with brand new PLC flat lens= 794µmols...I tested it over and over.
Brand new KB 80*= 763
2+ month old KB 80 after cleaning= 708µmol
Center readings at 11" from the sensors to LES with a 3070. Reflector cleaned with soapy water. Lens cleaned with soapy water, alcohol, and windex with the best results shown above, being windex.
I don't want any official conclusions from that but for me was enough to keep me on my path.
I have been getting some custom lenses. They are good. Some are great and near 100% transmittance(in test above). You might think if you can get glass that is so good why use both...why not use just the great glass in a lens form. But I still prefer reflector's more diffused distributes light vs collimated from a focusing lens for total light delivered. My lenses are for effective protection, while still relying on the reflector for the light distribution pattern.
Custom glass lens over ledil reflector...
View attachment 3619829 View attachment 3619830
Ledils own diffuser lens...work very well, plus cheap and lightweight.
View attachment 3619831
Here are some of the Ledil RZ lenses...
http://www.pacificlightconcepts.com/product/ledil-rz-diffuser-lens/
Weight of glass is always an issue compared to a poly. Even with thin flat lenses like I've been using. But any kind of focus/collimation adds weight fast.
