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Dashed lines indicate the post-filter spectra of the light from commercial white LED bulbs (light-emitting diodes) and CFLs (compact fluorescent lights) taken at the cage floor. Both spectra have negligible light below 500 nm. Superimposed on the light spectra are the relative absorbances for the two classes of tree shrew cones (long-wavelength sensitive, LWS; short-wavelength sensitive, SWS), produced by modifying the toolbox in Lucas et al.73 using data from Petry and Hárosi.27
