Patent ID: 7682037

Claim:
An apparatus comprising: a light-emitting device for illuminating blood, the light-emitting device comprising: a green light source configured to emit green light; a red light source configured to emit red light; a first reflective structure associated with the green light source and a second reflective structure associated with the red light source, the first reflective structure and the second reflective structure being configured to maintain separation of the emitted green light and the emitted red light while in the device; wherein the light-emitting device creates a light pattern outside the device having at least three light zones, comprising a first light zone defined by the emitted green light, a second light zone defined by the emitted red light, and a third light zone where at least a portion of the emitted green light and at least a portion of the emitted red light combine outside of the apparatus, wherein a contrast between a red color illuminated with either the first or second light zones and the red color illuminated with the third light zone causes the red color to be perceived as standing out compared to non-red colors.