So... First, a quick biology lesson on cones and rods.
Rods are photoreceptive cells that are very light responsive and are responsible for most night vision capability. However, very dim light results in colorless vision and rods don't capture color.
Cones are photoreceptive cells that are bright light responsive and are responsible for most color vision in good light.
Hamsters, it turns out have 97% of their eyes as rod cells. This gives them very good low light capability, which is handy in a nocturnal animal, but poor performance during the day. As a result, hamsters have very little to no color capability, so yes, colorblind. As an additional note, vision from rods tends to be less sharp, and so hamsters also have a fuzzier vision.
Nevertheless, they do have cones, but the type and distribution of the cone cells means that hamsters tend see more into the green/blue/UV end of the spectrum. Infrared is in the opposite direction and so less visible to hamsters.
Oddly enough, since you commented on it, I would have actually expected nocturnal animals to tend more to the ultraviolet end. However, it turns out that the green part of the spectrum is where many nocturnal animals see (hopefully that Google excerpt link will work) and most are blind to blue and red light where the vision falls off.
All of which boils down to: you should be fine with the LED.