The G4s are much more that they are cracked up to be. The spread alone is awesome, they completely illuminate your tank with great color blending. There is little to no dark spots now with their new lenses. They lost a little par but nobody really needs it unless they are running a deep tank. They did though increase the par in the 420nm which is a blessing. Its a great light and I have nothing negative to say about it except its a bit pricey.