Like Dr. Steinsaper had said, the Aerolase laser is a yag laser - of which is attracted to melanin, hemoglobin and water. What you're looking for in a photofacial is clearance of any uneven skin tone, sun or age spots, and a skin tightening effect as a result of new collagen growth. It is a great all-around procedure for facial rejuvenation.
IPL can be a decent modality to treat light skin for freckles and spots, but will not be effective in evening reddened areas or filling out the skin. The main problem with IPL devices is that they can be very dangerous to use on tan or dark skin as they can result in burning or hyper/hypopigmentation. Also, you're going to have to be lathered in gel during your treatment, which can be quite lengthy. Hope you found this information helpful! Best.