*Based on American Orchid Society guidelines and local experience.
** Phragmipedium besseae and P. schlimii hybrids require lower light than other Phrags
Shade cloth suggestions are for high solar radiation levels in the Riverina and are a guide only. Lower light levels and more shade than indicated above may be desirable in very hot weather.
The figures below are for Wagga Wagga NSW at midday in late November*.
A bright sunny spring day in full sun is about 10,000 fc or 110,000 lux (very high light)
A covering of 70% shadecloth gives 5,000 fc or 52,000 lux (medium-high light level)
Opal colour polycarbonate roof allows 2,800 fc or 30,000 lux (medium light level)
Polycarbonate roof and 60% shadecloth allows 1,100 fc or 12,000 lux (low-medium light level)
An overcast day with no strong shadows is about 700 fc or 8000 lux. (low light level)
*In mid summer the light intensity at Wagga Wagga increases to about 11,900 fc or 128,000 lux
The intensity of sunlight (lux) varies with season and latitude.