Maratac aaa mod to 660nm Red
pic is a link to info about using it to stop migraines
fwiw, the mod results in all 3 modes being the same, 7 lumens on my meter. This is not a problem for use as a Red Light Therapy tool.
atm you can get a Red LED Sofirn C01R with 3 modes. I recommend them for red light therapy if you dont mod your own lights. They have 3 working modes, and are inexpensive.