Calathea Light Requirements
Calathea needs 150–400 fc (NEVER direct sun), classified as medium light. Best window direction: North-facing (ideal) or 4–6 ft from an east window.
How low can it go?
Tolerates 100 fc but stops producing new leaves. The iconic patterns dull in low light.
Slowed growth, dulled leaf patterns, leaves stay smaller than expected.
How much is too much?
Tolerates bright indirect. Any direct sun — even morning sun — burns the leaves instantly. This is the single brightest no-direct-sun rule of any common houseplant.
Instant brown scorch patches from direct sun; leaf fade and curl in bright indirect over 600 fc.
The most common Calathea light mistake
Putting a calathea in a south window for "more growth." Calatheas evolved on a rainforest floor — they NEVER receive direct sun in the wild. Burns within hours of direct exposure.
Grow light substitute
A 15W full-spectrum LED 18 inches away is plenty. Anything stronger risks burn. Calatheas are the easiest plant to OVER-light.
See our best grow lights guide for tested picks.
How to measure light at home
Download a free smartphone app like Light Meter or use a $20 digital light meter. Measure at the leaf surface, not the ceiling. As reference points: 50–100 fc is dim corner light; 100–400 fc is medium indirect; 400–1000 fc is bright indirect; 1000+ fc is direct sun.
Botanical reference: NC State Extension — Calathea
For full Calathea care — watering, humidity, soil, pests — see the Calathea care guide. Or learn where to place a Calathea in your home.