Which IPL Machine produces better results for brown spots?

Generally, a minimum of 3 treatments spaced 3-4 weeks apart yields optimal results.  It is important to understand that a maintenance IPL treatment once or twice a year after the initial series is recommended to maintain your original results. We use the Palomar Icon which is wonderful for treating brown spots and uneven skin tone. However, in my experience, the best results when treating brown spots and pigment occur as a result of a thorough consultation(to develop a home care regimen structured to deal specifically with pigment), the practitioner and appropriate settings. 

There are many good manufacturers of IPL machines.  The biggest variability will be in the experience of who is performing the procedure and what settings are used.  Although I am partial to the Palomar Starluxe, good results can be obtained with either of teh macjhines mentioned above.

In my opinion, the best IPL for brown spots is the Palomar ICON IPL.  Most spots are gone in 1-2 treatments! Of course a high SPF sunscreen is needed for maintenance to prevent recurrence.

IPL works great for brown spots, Q switched works great as well, I tend to use both combined with topical bleaching cream.  In my experience it takes more than one treatment always.  I hope that helps!

Many laser companies make good IPL machines and both Lumenis and Cutera are no exception.  The underlying IPL (Intense Pulsed Light) technology will be the same in all machines.  Some machines are stronger than others but all will be effective at removing brown spots.  Generally one treatment is needed.  Sometimes, especially if the spots are fairly light or if your skin is fairly dark, two or three treatments will remove nearly all sun spots.