Figure 1. Spectra of growth and measurement light.

Relative quantum flux and spectral distribution of (A; thin solid line) artificial daylight spectrum, (B; dotted line) artificial shade spectrum, (C; left thick line) filtered 480 nm (nominal) irradiance (peak wavelength 478, 10 nm FWHP), and (D; right thick line) 700 nm (nominal) irradiance (peak wavelength 695, 10 nm FWHM). The broadband spectra were used as growth irradiance treatments and the narrowband spectra were applied separately as actinic irradiance during gas exchange measurements.