Angela, for this specifically, I use the Warp units from Quantum Devices (the folks that developed the technology for NASA, and led the way for many initial studies). Their Warp 10 unit has an area of 10cm2, is battery operated and has an 80 second cycle, while the Warp 75 unit is 75cm2 and is plugged in -- the Warp 75 is the one used in hospitals but is for sale to the consumer as well. These have microchip diodes smaller than a grain of rice. The other device that I have found to be effective (and share with my geriatric neighbours) is the DPL panel, I have many pairs of the original panels which have 660 & 850nm diodes. The device has been updated so my experience is with the initial iteration....These panels are effective for superficial wounds and muscle aches. All of these work for neuropathy as well as wound healing. For spot ulcers I use a Laserlift pen which offers different beam heads and it's what I use for my pets too. The correct frequency, wavelength & power are all you need to look out for and the marketplace right now is flooded with effective options which use the new SMD chips and can offer more than one wavelength. Basically, the correct blue helps heal by destroying bacteria and has some anti-inflammatory effect, the red is wound healing (including reversing atrophied fibroblasts and rebuilding more than 3 types of collagen, so helps intractable wounds [e.g., diabetic] but also nerve pain -- it's the only safe and effective modality with efficacy for both, to date), while the green stimulates lymphatic action. Just remember that if you put the light on active bleeding it will stimulate flow. Hope that helps!