Differences Between IPL and LED Skin Treatment?

IPL is designed to work well for:Brown pigmentRed vesselsSun damageIn general, the multiple wavelengths of light have much more energy to be absorbed by the targeted damaged pigment, blood vessels and collagen. LED is good if the damage is very minor or someone can't have any downtime at all. It must be a really weak light source if it takes 24 sessions.

Intense Pulsed Light (IPL) is a broadband light device that delivers a spectrum of wavelengths that treat red spots (blood vessels), brown spots (sun spots) and sun-damaged skin. Results/effects are usually very obvious.
Gentlewaves is an example of an LED photomodulating device that emits a 590 nm wavelength yellow light at a low level. Some studies suggest that exposure to the LED light can hasten the reduction of redness for example, after treatment with the IPL. Some claim that the LED can treat sun-damaged skin and fine wrinkles.
Unless someone can convince me otherwise, I tend to believe that the LED does little, if anything for sun-damaged skin and fine wrinkles, based on a recent study that concluded there was no objective improvement in photoaging with use of the device. LED light may be beneficial for individuals with rosacea/sensitive skin, but I don't believe there is enough supporting data to make any recommendations in this regard.
Hope this helps.
Good luck.