Originally Posted by ThatGuyWithTheFish
Why do you consider 50 PAR to be high light? I've read somewhere else that they say 100 is high! Maybe they're using different units/measurements.
PAR values are subject to change and based on the posters (Hoppy) experience... in this case Hoppy has a lot.
Another thing to consider is the PAR values are at the substrate, so if you have 50 PAR at the substrate you could easily have 150 at the water surface.
Lastly, it has been said by many people that if you have 50PAR at the substrate there isn't a plant you can't grow with proper CO2 and ferts.