What is TIR?TIR stands for Total Internal Reflection. By redirecting more of each LED cluster’s output in a usable direction (in your tank), TIR lenses are able to boost peak PAR levels by up to 45% and total (average) PAR levels by up to 23% beneath the fixture without sacrificing spread  or consuming additional power.
On the Left is a Radion using the current lens and reflector On the Right is a Radion using the the new TIR lens kit. Readings where taken over a 30x30 inch area at 12 inches from the light.
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Manufacturer Ecotech Marine