Indoor Plant Lighting Explained: Foot-Candles, Lux & Directional Sun

Lighting is the single most critical factor determining whether your indoor plants flourish or slowly decline. Yet "bright indirect light" remains one of the most misunderstood terms in gardening.

In botanical science, light intensity is measured in Foot-Candles (fc) or Lux. Low-light tolerant plants like Snake Plants and ZZ Plants require at least 50 to 100 fc. Medium-light plants like Monsteras and Pothos thrive between 200 and 500 fc, while Fiddle Leaf Figs need 500 to 1,000+ fc.

South-facing windows deliver the strongest, longest sunlight during the day. Placing plants 3 to 5 feet back from a south-facing window with sheer curtains provides the ideal "bright indirect" sweet spot without scorching delicate foliage.

North-facing windows provide gentle, consistent light suitable for ferns, calatheas, and peace lilies.

With the Plantus app, you can use your smartphone built-in hardware light sensor to take real-time foot-candle measurements across every room in your home!