Incorrect. The focus adapter makes any laser no matter the wavelength more powerful by preventing ambient scattering and interference. What makes a blue laser more powerful than a green laser is the narrower wavelength and therefore a higher power in the coherent beam.Tom Goldman said:Jayrob created a phaser in the past that used a green beam [http://laserpointerforums.com/f51/tutorial-star-trek-phaser-mod-green-46761.html], but it's not as powerful as this one due to some sort of new custom focus adapter.
Remember, in order of decreasing wavelength and increasing power, it's ROYGBIV.
(edited because the coffee made me more exact)