What Colour Light Is Best For Aquarium Plants

Many people who love aquariums want to make their underwater world colorful and full of life. Along with things like clean water and different types of plants, having the right kind of light is really important. 

In this guide, I’ll explore the interesting topic of lighting for aquarium plants. We’ll talk about how different colors of light, how bright it is, and how it spreads around can affect your underwater garden. 

Whether you’ve been taking care of aquariums for a long time or you’re just starting out, this article will give you good information to help your plants grow well and your aquarium look beautiful. So, let’s start.

How to Pick the Best Planted Aquarium Light

Just like plants in your garden need sunlight to grow, aquarium plants also need light for their growth. This process is called photosynthesis, where they change sunlight into energy to fuel themselves. 

But here’s the interesting part – the color of the light actually makes a difference. The various colors of light affect how plants grow and develop. 

So, let’s take a closer look at what you should think about when picking the right color of light for your aquarium plants.

1. Color Spectrum

Think of light as a bunch of different colors, like the colors you see in a rainbow. These colors are measured using a scale called Kelvin (K) temperature ratings. 

When it comes to making your aquarium plants grow well, there’s a special group of colors that do the job best. This group usually falls between 5000K and 7000K. It’s like copying the sunlight that plants really like.

Now, there are two colors of light that are like superheroes for your plants. One is blue light, which falls in the range of about 450 to 500 nanometers (nm), and the other is red light, which is around 640 to 680 nm. 

These two colors are super important. They help your plants become strong and have really healthy leaves. You can think of them as the special ingredients that make your aquarium plants thrive.

2. Light Intensity

Different plants have different needs for light, but here’s a rule of thumb: try to aim for about 30-50 PAR (that’s short for Photosynthetically Active Radiation) at the bottom of your tank.

Plants that love a lot of light might need stronger brightness, while plants that are okay with less light can do well with softer brightness. It’s like finding the right balance. Look at the kinds of plants you have in your aquarium and adjust the light accordingly. 

This way, you can make sure they’re not getting too much light or not enough light, but just the right amount to keep them happy and healthy.

3. Light Spread

Making sure that light reaches every part of your aquarium is really important. You don’t want some areas to be in the shade because that can stop your plants from growing well. 

So, when you pick a lighting system, go for one that can spread light across the whole tank. This way, you won’t end up in places where the light is too weak or doesn’t move much.

Having the ability to adjust how the light is set up can be super helpful. It’s like customizing the way the light is spread based on the size and shape of your tank. 

This helps to make sure all your plants get the light they need, and none of them miss out. So, it’s like giving each plant its fair share of sunlight.

Top Choices for Awesome Aquarium Plant Lights

Image Credit: aquariumcoop.com

Now that we’ve covered the science behind aquarium plant lighting, let’s take a look at some top-performing products available for purchase on Amazon.com:

1. NICREW ClassicLED Aquarium Light

The NICREW ClassicLED Aquarium Light acts like a small sunbeam created especially for your plants. It’s similar to hosting a vibrant light celebration with calming white and blue tones that your plants will really like.

This light is an excellent option for a variety of plants – both those that like swaying with the water and the ones that grow tall, resembling trees. And here’s something great: it’s easy on your energy consumption, so your electricity bill won’t have any unexpected surprises for you.

2. Finnex Planted+ 24/7 LED Aquarium Light

The Finnex Planted+ 24/7 LED Aquarium Light works just like a special remote control made for your plants. It comes with a unique function that copies the sun’s usual routine, starting from sunrise, going through the day, and ending with sunset.

It’s like taking your plants to a sunny beach day! Offering a range of colors, it’s a light festival that supports your plants in growing healthy and cheerful. 

No matter if you’re new to aquariums or an expert, this light will give your plants the sense of being in their own tropical heaven.

3. Hygger Full Spectrum Aquarium Light

The Hygger Full Spectrum Aquarium Light gives your plants a wide array of colors that work like a magic boost for their growth. It’s as if a fantastic burst of colors has happened.

This light covers a full spectrum of various shades, much like a nutritious feast for your plants. It includes everything from red to blue to green – a true party that guarantees your plants get all the nourishment they require to show off their most vivid colors.

And here’s the extra benefit: You can easily adjust the brightness to match your plants’ preferences. It’s like offering them a custom-made experience!

How Does Blue Light Impact Aquatic Plants?

Have you ever wondered how the type of light in water affects underwater plants? Well, there’s this special light called “blue light” that has a big impact on these plants. Think of it like the sunlight for plants underwater.

You see, blue light is like a superhero for underwater plants. It goes deeper into the water compared to other colors of light. This is super important because it means that plants at different levels in the water can get the light they need to grow.

Not only that, but blue light also helps plants to grow in a certain way. It’s like a personal trainer for them, making them grow more compact and bushy. Plus, it’s like a painter too – it helps bring out their natural colors, making them look even more beautiful.

So, if you’re setting up an aquarium with plants, remember that blue light is their favorite food. It’s like giving them the best environment to live and grow in. Just like how we need good food and sunlight, aquatic plants need their special blue light to thrive.

Advantages of Blue Light in An Aquarium

Blue light isn’t just beneficial for plant growth; it offers a range of advantages for your aquatic ecosystem:

1. Boosted Plant Growth 

You know, blue light is like a wake-up call for underwater plants. It tells them to start making something really important called “chlorophyll.” Chlorophyll is like their special recipe for making food. 

When plants have enough blue light, they become experts at cooking up this special food using a process called photosynthesis. And guess what? This makes them grow faster and stronger like they’re on a super-speedy growth spree. 

So, you can think of blue light as their growth booster, making them healthier and shooting them ahead in the growth race.

2. Vibrant Colors

Blue light works wonders on colors underwater. It’s like a special light that highlights the real, stunning colors of plants and fish beneath the water’s surface. Think of it as an artist’s brush that makes everything stand out with its true shades.

So, when you add blue light to your setup, your underwater world transforms into a mesmerizing work of art, brimming with colors that make your eyes twinkle with joy. 

3. Keeping Algae in Check

Blue light takes on the role of a protector against troublesome algae. It acts as a guardian, keeping certain types of algae from growing too much. With blue light present, your aquarium’s environment remains well-balanced and peaceful. 

This prevents an excessive invasion of those annoying algae, ensuring a cheerful and healthy underwater space for all your aquatic friends.


Choosing the correct color of light for your aquarium plants is a crucial step in making your underwater scene look amazing. By thinking about certain things, you can make sure your plants grow well and your aquarium becomes a stunning centerpiece in your room. 

Don’t forget to check out all the different types of lights you can use, and feel free to try different setups to find what looks best for your special underwater garden. I hope the information in this guide helps you out. Thank you.


Will algae grow under blue light?

Blue light can stop some algae from growing, but it might make different kinds of algae grow more. To avoid too much algae, keep the lights on at the same time and think about using other ways to control algae.

Do fish like white light?

Fish are happiest when they live in a place that feels like their home in nature. By using both white and blue lights that imitate the sun during the day and the moonlight at night, we can help the fish stay healthy and act the way they do in their natural surroundings.

How many hours of light do aquarium plants need?

Typically, plants in an aquarium like to have light for about 8 to 10 hours each day. But remember, different types of plants and how strong the light is can change this.

It’s important to keep an eye on the plants and change how long the lights are on to keep them healthy.

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