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6” would be like a spot light in a DT. Maybe frag tank if you had enough of them spread out to squeeze out every par, but agreed not practical.
Radion G6 - EcoTech Marine
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- Optimal mounting for Radions at approximately 7 inches (18 cm) above the edge of the tank....
There is a big difference between 90 degree tir lenses and 120+ degree lensing, not to mention more spread deeper.
But yea 6" would need to be proven.
It is theoretical.
There is the diffuser.