How to Choose LED Lighting for Planted Tanks
By Pro Shrimp | Published: 2026-10-19
Category: Buying Guides
Learn how to choose LED lighting for planted tanks using PAR, Kelvin, spectrum and tank height so your plants grow well without algae problems.
Quick answer
Match the light to your plants first: a cost-effective white LED with around 8500K and moderate PAR suits low-demand setups, while a full RGB LED built for plant growth is the better pick when you run CO2 and want aquascape colour control.
Match the light to your tank's plant demand, not the tank size alone
Aquarium light intensity matters more than wattage claims. A low-demand tank with slow growers can run on modest output, but a densely planted aquascape with carpeting species needs stronger, more even light. If you dose CO2 and fertiliser, brighter light is only useful when those other inputs keep up; otherwise you simply feed algae.
Kelvin and spectrum: what 8500K and RGB actually change
Kelvin describes the colour appearance of white light, not its plant-growing power. An 8500K white LED gives a crisp, slightly cool look that suits many community and plant tanks. RGB lighting for plants adds separately controlled colour channels, which lets you tune red and blue output and make red plant species and fish colours pop. If you want a natural daylight look with simple operation, a fixed white spectrum is easier; if you want adjustable colour and stronger plant response, RGB is worth the extra cost.
Mounting and tank type decide which kit fits
Open aquariums need support arms or a raised bracket to lift the light above the water, while closed tanks need clips or a housing that tolerates a hood. Check the cable length and whether a switch is built in, because a light that reaches your socket without an extension makes weekly maintenance less annoying. If you plan to add a controller later, confirm the model is compatible before buying.
Where the catalog leaves gaps
Some listings do not state PAR at a specific depth, so treat any single PAR figure as a guide rather than a guarantee for your tank height. If a specification such as dimming range or controller compatibility is absent, assume you will need to confirm it before purchase instead of guessing.
Decision rules for choosing your planted tank LED
- Low-tech tank, easy plants: Choose a white LED with moderate PAR and no CO2 injection, and run it 6-8 hours a day. If algae appears, shorten the photoperiod before buying a stronger light.
- CO2 and aquascaping: Choose a full RGB LED rated for plant growth, then set colour channels for red plant response and adjust intensity to match CO2 and fertiliser.
- Open vs closed aquarium: Pick a kit that includes extendable support arms for open tanks or clips for closed tanks, and add a raised bracket only if you need more height above the water. Measure your tank rim and hood clearance before ordering.
- Budget and lifespan: Compare price against rated LED life and included accessories; a cheaper light with a shorter lifespan and no mounting kit may cost more once you add parts.
Product facts
- Superfish Eco LED Lighting: Emits PAR 137 at 8500K with a 30,000-hour lifespan and a 1.8 m cable with on/off switch. A solid low-cost white light for low to medium-demand planted tanks where you want simple plug-and-play operation.
Superfish Eco LED Lighting - Superfish Scaper LED RGB Lighting: Full RGB spectrum with 50,000-hour LEDs, supplied with a 200 cm cable, switch, adapter, extendable arms and closed-tank clips. The better fit for CO2-injected aquascapes and red plant colour, and the kit covers both open and closed mounting out of the box.
Superfish Scaper LED RGB Lighting
Who should choose which light
Best for
- Beginners and low-tech planted tanks that want a simple, affordable white LED
- Aquascapers running CO2 who want RGB colour control and a complete mounting kit
Not for
- Reef or marine tanks that need a different spectrum and intensity profile
- Very deep tanks where a single PAR figure cannot be confirmed for your depth
