| http://www.w3.org/ns/prov#value | - excitation light source operable to emit modulated light at a primary wavelength; and (ii) a target optically coupled to the excitation light source, the target including a photoluminescent material having a characteristic to emit light at a secondary wavelength in response to absorbing the light at the primary wavelength; (b) a scanner operable to direct the light at the secondary wavelength emit
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