Multispectral light source

A medical method for illuminating a target surgical area to aid tissue differentiation, said medical method comprising:

• providing a medical illumination device comprising:
• at least one illumination source configured to generate light,
• a plurality of optical filters, wherein each optical filter is configured to substantially remove a pre-selected spectral band from the light when the light passes through the optical filter, and
• a plurality of turrets coupled to the plurality of optical filters,
• wherein each turret is rotatable, about an axis parallel to a transmission path of the light, among a plurality of positions,
• wherein the plurality of positions of the plurality of turrets define a plurality of spectral configuration settings,
• wherein each spectral configuration setting corresponds to a respective subset of plurality of optical filters being aligned with the transmission path of the light such that the light passes through the respective subset of the plurality of optical filters and is transformed into a respective type of filtered multispectral light,
• wherein the plurality of turrets comprises:
• (i) a first turret rotatable, about the axis parallel to the transmission path of the light, among a plurality of first positions;
• and
• (ii) a second turret rotatable, about an axis parallel to the transmission path of the light, among a plurality of second positions
• wherein the plurality of optical filters comprises a plurality of first optical filters and a plurality of second optical filters,
• wherein the plurality of first optical filters are coupled to the first turret with each first optical filter at a respective location around the axis,
• wherein the plurality of second optical filters are coupled to the second turret with each second optical filter at a respective location around the axis, and
• wherein each subset of the plurality of optical filters comprises one of the plurality of first optical filters and one of the plurality of second optical filters;
• selecting a spectral configuration setting from among the plurality of spectral configuration settings, wherein selecting the spectral configuration setting comprises rotating the plurality of turrets about the axis to position the respective subset of the plurality of optical filters, which corresponds to the spectral configuration setting, in alignment with the transmission path of the light;
• and
• after selecting the spectral configuration setting, illuminating a target surgical area of a patient with the respective type of filtered multispectral light for the spectral configuration setting from the medical illumination device,
• wherein, for at least one of the plurality of spectral configuration settings, the respective subset of the plurality of optical filters causes the filtered multispectral light to comprise substantially no visible light emission beyond 650 nm.