Nano LED Light Guide
How compact nano LED fixtures light small and pico tanks, why their low heat suits tiny volumes, and how to set photoperiod and intensity.
What it is
A nano LED light is a compact LED fixture for nano and pico aquariums, typically under about 40 litres. It usually has a small footprint and may clip onto the rim or stand on a slim leg, providing light for low-tech plants or shrimp displays in tight spaces.
Why LED for nano tanks
LED fixtures are generally the most efficient aquarium lighting type and produce very little heat. Low heat output is especially valuable in nano and pico tanks, because small water volumes are more easily warmed by lighting; LEDs avoid overheating these tiny volumes.
Efficiency and lifespan
LEDs are far more energy efficient than older lighting: leading LEDs exceed 200 lumens per watt, compared with about 50 to 100 lumens per watt for compact fluorescents and only 10 to 17 for incandescent lamps. LED lamps also last much longer, typically around 15,000 to 50,000 hours, versus roughly 1,000 hours for an incandescent bulb. Because they run cool, plants can be placed close to an LED source without heat damage, which suits the tight geometry of a small tank.
What it can grow
Modern LED fixtures are capable of growing both low-light and high-light plants. A compact nano LED is generally enough for low-tech plants and shrimp tanks, where strong intensity is not the goal.
Photoperiod
- On a new tank, start with about 6–8 hours a day so plants can adjust.
- As the tank matures, gradually increase toward 8–12 hours a day.
- Never leave the light on continuously; plants need a dark respiration period at night.
- Use a timer, which is more reliable than manual switching.
Intensity tuning
If the fixture is dimmable, begin at roughly 20–40% brightness and increase gradually only if no algae appears. If an algae bloom develops, reduce the brightness or shorten the photoperiod.
Sizing
Nano LED fixtures are intended for small tanks, broadly in the range of roughly 5 to 40 litres, matching the limited footprint of nano and pico setups. They commonly clip onto the rim or stand on a slim leg, so they can be positioned to cover the small surface without a large overhang, and their low power draw and low heat output suit the limited water volume of these tanks.