How the Sunlight Effects Plant Growth

  • 200 – 280 nm UVC ultraviolet range which is extremely harmful to plants because it is highly toxic.
  • 280 – 315 nm Includes harmful UVB ultraviolet light which causes plants colors to fade.
  • 315 – 380 nm Range of UVA ultraviolet light which is neither harmful nor beneficial to plant growth.
  • 380 – 400 nm Start of visible light spectrum. Process of chlorophyll absorption begins. UV protected plastics ideally block out any light below this range.
  • 400 – 520 nm This range includes violet, blue, and green bands. Peak absorption by chlorophyll occurs, and a strong influence on photosynthesis. (promotes vegetative growth)
  • 520 – 610 nm This range includes the green, yellow, and orange bands and has less absorption by pigments.
  • 610 – 720 nm This is the red band. Large amount of absorption by chlorophyll occurs, and most significant influence on photosynthesis. (promotes flowering and budding)
  • 720 – 1000 nm There is little absorption by chlorophyll here. Flowering and germination is influenced. At the high end of the band is infrared, which is heat.
  • 1000+ nm’s 600w LED grow light 3w, LEDs Wavelength: Red 660nm + 630nm, Blue 475nm + 430nm, Orange 615nm, White 4500k, the design of this new all in one Red+Blue+Orange+White(RBOW) grow light allows maximum level photosynthesis food production, growth and flowering all in one. It is the new RBOW system providing maximum plant health, beauty and productivity.

Choosing The Right Kind LED Grow Lights Is Extremely Important

Choosing the right kind LED grow lights‘ is extremely important for every purchaser because every light is used for different plants and flowers, so depending on the plant that the person wants to grow, he should select the correct light for his use.

First of all, every purchaser must recognize the low quality light from the high quality lights. The low quality can produce such medium heat as to allow the seedlings to grow only and not the plant for that matter. Then you should be aware of the light color you need to get for your plants. Mostly people consider white and green color lights to be essential for the growth of the plants, but this is a very wrong concept because green light is always reflected by the plants because of the green chlorophyll and white light does not contain enough energy as to help the plant to make its food. The best colors for the growth of every plant are blue and red. These colors help the most in photosynthesis.

Other colors of LED growing lights are also useful for plants but they alone cannot give enough energy and heat to help in photosynthesis. Others color lights need to be in combination of 2 to 3 colors to make the procedure happen properly. If anyone is trying to grow herbs and vegetables only, then he should use blue LED’s only, because these give strength to the roots and the stems to grow vigorously. The leafs also take more energy from blue light as compared to other colored lights because blue color helps to fight diseases, so it keeps the plant healthy to grow more quickly.

The red LED grow lights are used mostly for growing fruits and flowers at the maximum pace but with all the health required by the plants. The red color, being similar to autumn season, indicates to the plants to produce seeds in the form of flowers and fruits. This color is highly beneficial for the growing of fruit plants because the red color gives out the most energy and heat to help the plant to build into a strong one.

The combination of these color lights is also useful for the growth of plants but not to that extent that every plant will definitely need a double spectrum or a tri-band spectrum. These combination are only made to bring variety and create a range of color lights in use. The most common is the combination of red, blue and orange light, which is used for every plant. Various other combination like that of red, white and pink, or of blue, white and yellow are also useful for fruits and flowers or herbs and vegetable respectively.

The LED grow lights are available in varying sizes according to the amount of plants needed to be grown. The size of these lights range from 3mm to 10mm, with the smaller ones used for a small bundle of plants, while the bigger light for the larger bundle. But one should always remember to never to use the larger size of light for a smaller bundle to make the plants grow quickly, because it will only damage the plants and flowers.

LED Aquarium Lights Spectral Analyses

The Heart of the Aqua Illumination System – Powerful LEDs and Lenses

AI incorporates into their luminaires some of the most powerful LEDs on the market– Seoul Semiconductor’s Z-Power ‘P4’ white LEDs (3.8 watts each) and blue LEDs (2.5 watts each). These, in conjunction with Khatod lenses manufactured especially for use with Seoul Semiconductor’s LEDs, result in focusing light into strong ‘beams’ which put light where you want it – into the aquarium and not on the walls and floor.

The white LEDs are ~6,500K, and the ‘blue’ LEDs peak at a wavelength of 460 nm.

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Photosynthetically active radiation (PAR) was measured with an Apogee Instruments quantum meter with cosine-corrected submersible sensor. This instrument is within its recommended 2-year calibration period.

A hand-held Project Star spectrometer demonstrated a visual display of light energy between 400 and 700nm, and was recorded by an Olympus C-5050 digital camera in ‘macro’ mode.

Spectral quality was analyzed with an Ocean Optics USB-2000 spectrometer and cosine-corrected CC-3 collection lens. Raw data from the spec was interpolated to 1nm increments. This information was further analyzed for color percentage in a proprietary Excel program.

Temperatures were measured with a ‘laboratory grade’ mercury thermometer and a laser-sighted infrared temperature ‘gun’.

Comparison of the LED and metal halide PAR were made under similar conditions. Distance from the lamp(s) was 5 inches. LEDs were, of course, housed in AI’s luminaire.

The metal halide (an XM 250-watt 20,000K; burn time ~100 hours) used a polished aluminum parabolic reflector and was driven by a Coralife ballast. There was no ‘shield’ between the lamp and sensor. PAR measurements were taken every 1” across a black grid.

Spectral Analyses

See the ‘Methods’ section for a description of spectral analyses protocols.

White LEDs

The AI luminaire houses 16 white LEDs. Generally, white light is produced by a LED generating blue light in combination with fluorescent phosphors. These phosphors absorb some of the blue radiation and fluoresce it as broad spectrum light, resulting in a ‘white’ light. See Figure 2 and 3.

Figure2. Spectral Signature of the Seoul Semiconductor ‘white’ LED.

Figure 3. A visualization of the spectral qualities of the Seoul Semiconductor ‘white’ LED.

Blue LEDs

See Figures 4, 5 and 6 for analyses of the Seoul Semiconductor ‘blue’ LED.

Figure 4. Spectral Signature of the Seoul Semiconductor ‘blue’ LED.

Figure 5. A visualization of the spectral qualities of the Seoul Semiconductor’s ‘royal blue’ LED.

Figure 6. A break-out of light produced by the blue LED.

White/Blue LED Combination

See Figures 7 and 8 for analyses of the light produced by the AI LED array (all ‘day’ lamps at 100% power).

Figure 7. A break-out of light produced by the blue and white LED combination.

Figure 8. A visualization of the spectral qualities of Seoul Semiconductor’s ‘blue’ and ‘white’ LED combination.

What is LED Lamp And Specialty Uses

An LED lamp (LED light bulb) is a solid-state lamp that uses light-emitting diodes (LEDs) as the source of light. The LEDs involved may be conventional semiconductor light-emitting diodes, to organic LEDs (OLED), or polymer light-emitting diodes (PLED) devices, although OLED and PLED technologies are not currently commercially available.

Since the light output of individual light-emitting diodes is small compared to incandescent and compact fluorescent lamps, multiple diodes are often used together. In recent years, as diode technology has improved, high power light-emitting diodes with higher lumen output are making it possible to replace other lamps with LED lamps. One high power LED chip used in some commercial LED lights can emit 7,527 lumens while using only 100 watts. LED lamps can be made interchangeable with other types of lamps.

Diodes use direct current (DC) electrical power, so LED lamps must also include internal circuits to operate from standard AC voltage. LEDs are damaged by being run at higher temperatures, so LED lamps typically include heat management elements such as heat sinks and cooling fins. LED lamps offer long service life and high energy efficiency, but initial costs are higher than those of fluorescent lamps.

Specialty uses

White LED lamps have achieved market dominance in applications where high efficiency is important at low power levels. Some of these applications include flashlights, solar-powered garden or walkway lights, and bicycle lights. Monochromatic (colored) LED lamps are now commercially used for traffic signal lamps, where the ability to emit bright monochromatic light is a desired feature, and in strings of holiday lights.

LED lights have also become very popular in gardening and agriculture by 2010. First used by NASA to grow plants in space, LEDs came into use for home and commercial applications for indoor horticulture (aka grow lights). The wavelengths of light emitted from LED lamps have been specifically tailored to supply light in the spectral range needed for chlorophyll absorption in plants, promoting growth while reducing wastage of energy by emitting minimal light at wavelengths that plants do not require. The red and blue wavelengths of the visible light spectrum are used for photosynthesis, so these are the colors almost always used in LED grow light panels. These lights are attractive to indoor growers since they use less power than other types for the same light intensity, need no ballasts, and emit much less heat than HID lamps. The reduction in heat allows time between watering cycles to be extended because the plants transpire less under LED grow lights. Due to this change in growth conditions, users of LEDs are advised not to over-water the plants.

LED Aquarium Light FAQ

Which of your LED lights are best suited for Tropical aquariums?

Tropical Aquariums are not light critical so you can use any light that gives enough brightness for you to see and enjoy your fish. The 120W LED aquarium lights with 2W chip and 300W LED aquarium lights are the highest brightness and give you lovely colours to make the most from your aquarium.

Which of your LED lights are best suited for Marine aquariums?

Most Marine aquariums are not light critical but do benefit from higher brightness so the 90W LED aquarium lights with 2W chip and 120W LED aquarium lights are the best option. LED’s enhance the colours of the fish so can make the aquariums look outstanding.

Which of your LED lights are best suited for Reef aquariums?

Reef aquariums are light critical and require the 90W UFO LED aquarium lights for high brightness and correct colour temperature.

Where can I find the technical information about each type of light?

Each of the short descriptions of the product has a link to the technical page of that product. It will give you the actual sizes, the number of leds and the lumen output and wattage used by each size of light.

Is the wattage of an LED an indication of its light output?

No. Wattage refers only to the amount of power used to run the LED and not to its brightness. The light output of an LED is measured in Lumens. There are many different types of LED and some 1Watt Leds have very low lumen output (10 for example) while other 1Watt LEDs have high lumen output (110 for example). Similarly some 3 Watt LEDs have very low lumen output while others have a very high lumen output. When buying an LED aquarium light always check the lumen output and only refer to the wattage as an indication of much it will cost to run.


In fishkeeping, color temperature has different functions and foci, for different branches.

  • In freshwater aquaria, color temperature is generally of concern only for producing a more attractive display. Lights tend to be designed to produce an attractive spectrum, sometimes with secondary attention to keeping plants alive.
  • In saltwater/reef aquaria, color temperatures are an essential part of tank health. Cooler temperatures are seen as getting through the water better, providing essential energy sources to the algae hosted in coral, that sustains it. Because coral receives intense, direct tropical sunlight, the focus was once on simulating this with 6,500K lights. Higher temperature light sources have become more popular as their success became widely known…first 10,000K, more recently 16,000K and 20,000K. Meanwhile, actinic lighting is used to make the somewhat fluorescent colors of many corals and fish “pop”, creating brighter “display” tanks.

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