Lux to PPF

[re_vogel]

I was doing some research on a quantum meter and came across this on apogee's page (http://www.apogeeinstruments.com/conversions/lux-ppf.html). Can Lux be converted to PPF (I assume Apogee knows what they are talking about) and has anyone ever compared a lux meter to a quantum meter to see how much drift there is?

[re_vogel]

Anyone? I have done some research and from what I have seen lux it somewhat correlated to PPF so it makes sense that you could use a lux meter to get an approximation of PPF but I was hoping to get some feedback from someone with experience (ie someone with both meters)