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Relative spectra of the lamps used in the experiments: High pressure sodium (HPS) lamps Osram NAV T-400W (Solid lines), Light emitting diode (LED) lamps (Round LED-light 92W with 3 chains, SoLa-Co) (Dotted lines) and pure blue LED (Round LED-light 92W with three chains, SoLa-Co) (Dashed lines).
