The best lights for a planted tank in 2026
The right light grows healthy plants and makes fish glow; the wrong one grows algae. For a planted tank you want enough PAR for your plants, a full spectrum with strong reds and blues, and ideally a controller so you can dial it in. These are our picks, from high-tech to easy low-light.
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Frequently asked questions
How much light does a planted tank need?
It depends on your plants. Low-light plants (anubias, java fern, cryptocoryne, mosses) thrive on modest output with no CO2. Demanding stem plants and carpets need high PAR — but high light without CO2 and ferts just feeds algae. Match light to plants, and only push PAR once you're dosing CO2 and fertiliser.
What is PAR and why does it matter?
PAR (photosynthetically active radiation) measures the light energy plants can actually use, at a given depth. It's a far better guide than watts or lumens. Aquascaping lights like the Chihiros WRGB series publish PAR figures so you can match output to your plant demands and tank depth.
How long should I run my aquarium light?
Keep a consistent photoperiod of about 6–8 hours a day on a timer. Longer or brighter than your plants can use is the fastest route to algae. If you get algae, cut the photoperiod and intensity before anything else.
Do I need an RGB light for plants?
Not strictly, but full-spectrum RGB lights render plant and fish colours beautifully and let you tune the look. Dedicated plant LEDs with strong red and blue output grow plants well; RGB adds control and colour pop on top.
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