Understanding Light Levels
Interior light levels form the growth potential of your plant. The term "bright indirect light" fails to convey anything concrete. Use these foot-candle (FC) ranges to understand what your plants actually need:
To measure light levels, use a dedicated light meter (like Darryl's LTH Meter!) or a smartphone app (search "light meter" or "lux meter"). Most apps measure in lux—divide by 10.76 to get foot-candles.
Under 100 FC
<1,100 lux
Very low light. Most plants will slowly decline at this level.
100 – 200 FC
1,100–2,200 lux
Low-medium light. Survival zone for low-light tolerant plants.
200 – 400 FC
2,200–4,300 lux
Medium light. Acceptable growth for most houseplants.
400+ FC
4,300+ lux
Bright indirect light. Good to excellent growth potential.
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