This is the only time any cautions of any type need to be taken is with high-brightness LEDs and Luxeons; the "danger" is only from the high intensities of these light sources - they are not point sources like lasers and cannot damage the eyes in the same manner. As long as you don't just place these LEDs or devices containing them right up to your eye and let it cook there for awhile, there is absolutely nothing to be concerned about here - unless the LED radiates light below approximately 420nm - then you may begin to face danger from UVA radiation. But you'd have to stare directly into the beam to even come close to eye damage. No worries at all about reflected radiation from a nonspecular (nonreflective) surface.