The luminous power (unit: lumen) between a light source and the area illuminated by it is measured using the lux (lx) unit. The illuminance is exactly one lux when luminous power of one lumen (lm) uniformly illuminates an area of one square metre. A lux measuring instrument is referred to as a lux meter or also as a photometer.
Minimum lux requirement for succulents
Succulents require 10000-15000 lux, succulents like echeveria and graptopetalum require more light than others. Succulents like sansevieria have less light requirement and can tolerate relatively low light conditions.
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