The solar photon #ux distribution was measured in the range from 400 to 1100 nm under a twin-span glasshouse and under the same glasshouse with blanked roof, external shading net and internal aluminized shade-screen. Measurements were also carried out under a twin-span polyethylene greenhouse, a multi-span greenhouse with "breglass and a polyethylene tunnel. For each greenhouse con"guration, the measured solar photon #ux spectra were used to calculate the solar transmission for the photosynthetically active radiation waveband (PAR), from 400 to 700 nm, the near infrared waveband (NIR), from 700 to 1100 nm, and the whole waveband (TOTAL), from 400 to 1100 nm. Other parameters having a physiological interest were also determined: the broadband PAR to TOTAL photon #ux ratio and PAR to NIR photon #ux ratio; and the morphogenesis-related parameters, such as the red to far red photon #ux ratio, the phytochrome equilibrium, the relative cycling rate, the blue to red photon #ux ratio and the blue to far red photon #ux ratio. The results provided a better insight on the quantitative and qualitative properties of the light environment under each greenhouse con"guration. Some signi"cant di!erences in the values of blue light quality related parameters were found between greenhouses. Minor changes were observed on the PAR : TOTAL and PAR : NIR photon #ux ratios, but indicated that glass and blanking tend to enrich the PAR content of the transmitted light, while the two plastic cover materials have the opposite e!ect, enriching the NIR content. These results stressed the need for a more precise characterization of modi"cations in light quality induced by greenhouse materials or shading devices as plant photosynthetic and photomorphogenetic responses may be signi"cantly in#uenced by these modi"cations.