Lighting is all about ecology.
Lighting is all about ecology.
The underwater world in nature has many beautiful scenes. For example, colorful corals on the bottom of the sea are swaying with the water, and fishes are swimming through the coral reefs. Or water plants grow in layers in the water to form an underwater forest.
Now people are starting to bring these things into their homes, in the form of aquariums.
However, when animals and plants are separated from the natural environment and grow in narrow aquarium space, people always have to spend a lot of mind to maintain their healthy growth and ecological cycle, and lighting is one of the important factors. Whether Small Polyp Stony Corals (SPS), Large Polyp Stony Corals (LPS) or freshwater planted, lighting is the source of their energy.
If the aquarium in home is put before the window with good daylighting, it also can receive sunshine. But the amount of sunlight coming in through the window is limited. As time goes by, the angle of solar irradiation changes, sunlight cannot shine through the window to the aquarium, so the animals and plants in the aquarium will not receive the sunlight for long enough. On the other hand, because the aquarium is a relatively closed space, the direct sunlight is very easy to make the algae in the aquarium excessive reproduction, which will make the water become turbid, harming to the ecological balance of the aquarium system.
Accordingly, to aquariums in home, appropriate artificial illume is necessary.
Sunlight is a kind of white light. Plants in nature are growing under the irradiation of the sun, it can be said that the sun is the most suitable light source for plant growth. Sunlight can radiate a uniform amount of energy at all wavelengths, including infrared and ultraviolet.
A light source that emits red, green, and blue, can also be white by mixing. However, when looking at the spectrum, we can find that the energy provided by this light source is limited to the narrow three wavelengths.
Plants rely on light for their energy. They use light in certain wavebands to carry out photosynthesis and provide energy for their growth. That is to say, the quality of the lighting will be honestly reflected in the growth state of the plant.
Only by providing a full spectrum of the bands needed by plants and a source of balanced energy like sunlight, can plants perform better photosynthesis and grow healthfully. However, under the light source of narrow spectrum like RGB, plants cannot obtain sufficient energy, so they grow slowly and even become dim and lifeless.
Of course, different plants at different growth periods have specific need of light. In order to provide the best growth formula for plants, the tunable spectrum is necessary.
Chlorophyll, the most important pigment for photosynthesis in aquatic plants, absorbs red and blue light. Carotenoids are accessory pigments for photosynthesis, absorbing blue light and some green light, but most of the green light is still reflected by the leaves, so aquatic plants appear green. But green light is by no means unnecessary. Studies have shown that green light plays a more important role in carbon fixation in the lower part of the leaf than red and blue light, so green light is also needed in aquatic lighting. The concept of photosynthetic active radiation (PAR) describes the spectral range of sunlight that can be used for photosynthesis. It has a range of 400nm to 700nm.
Red aquatic plants in freshwater aquariums add color to the landscape. Strong light is needed to keep the plants red. Red aquatic plants appear red because the anthocyanins in their cells are colored. Anthocyanin is also an accessory pigment that absorbs excess light energy to protect other organelles, especially DNA, from sun damage. Therefore, providing strong light is an important condition to keep anthocyanin active.
To sum up, white light with balanced energy supply in the range of 400-700nm within PAR is an appropriate choice for aquatic planted lighting, and strong light for red aquatic plants.
The photosynthesis of corals is mainly dependent on zooxanthella, which is symbiotic with coral polyps.
Coral lives on coral reefs at the bottom of shallow seas. When sunlight penetrates the water and reaches a coral reef, it is mostly blue-violet and ultraviolet light, while red light is mostly damped. Zooxanthella, which grows in this environment, is better at using blue light for photosynthesis, which provides the daily growth needs of corals.
In addition, corals can also emit beautiful fluorescence, it is because the fluorescent proteins in coral can absorb ultraviolet light and convert it to another color. Fluorescent proteins are designed to protect corals from too much ultraviolet light (UV). If the coral does not provide UV, the fluorescent protein will lose its function and will be gradually decomposed by the coral, thus making the coral lose the ability to emit fluorescence permanently. Therefore, in the aquarium, the appropriate ultraviolet (UV) irradiation, can stimulate the coral fluorescence protein, so that the coral reef to maintain the colorful fluorescence.
However, a pure blue environment results in very low color rendering. Add some white light so that the colorful coral and fishes’ scales are shown, at the same time, getting higher PAR.
Color rendering index (CRI) is important for aquarium lighting.
CRI is a parameter used to evaluate quantitatively the degree of similarity between the color displayed by a light source and the standard light source. The closer the value is to 100, the closer the color of the object under the light source is to the color of the object under the standard light source.
High CRI allows aquatic plants, SPS, LPS and fish to display their colors accurately, making them beautiful and natural. At the same time, it allows us to accurately observe their growth state, and to find diseases or poor growth state timely, so as to adjust.
YUJILEDS provides up to 98 CRI LED solution, close to the daylight spectrum, restoring the most accurate nature colors of fish, aquatic plants, SPS and LPS.
Customized spectral solutions to provide targeted lighting for aquatic plants and coral reef.
Full options of different LED chips, tailored to the specific spectrum of biological needs, including ultraviolet and infrared.
Full spectrum base with high CRI LED to render the most natural appearance of the creatures and landscape in the aquarium.
With wide CCT options, YUJILEDS offers all feasible colors for photography applications including customization demand.
Tunable spectrum service which can provide the appropriate lighting recipes for plants at different growth periods.
Efficiency optimization proposals to get more light energy with less electricity.