Global Tech LED has created a combination of Light Emitting Diodes to be tuned specifically to aquariums. The Modules consist of Royal Blue diodes and 5000K white diodes, reaching the entire spectrum of light while still focusing on the blue spectrum that a lot of plants and corals require for growth. Of course not all species are equal in this matter. There are some species that specifically require the red spectrum of light so it is important that you research what wavelength your tank requires.
For most tanks, Global Tech LED’s aquarium light will be both aesthetically pleasing and perfect for growth of the tank. If you have any questions regarding our Aquarium module, please call us at 1.877.748.5533.
Some things to keep in mind when lighting your tank:
Light Intensity – Measured in Lux and Watts
Light intensity can be measured in two ways: at the surface it impacts (in lux), and at its source (in watts).
Light intensity measured at an impacted surface is expressed in lux, an international metric unit of measurement similar to a foot-candle: 1 foot-candle equals 10.7 lux. The intensity of the sun on the water surface above a reef can reach values exceeding 120,000 lux. However, varied weather patterns and air quality causes this measurement to average approximately 75,000 lux. As sunlight enters the water and the different wavelengths are absorbed, the light intensity diminishes.
Water clarity determines the speed at which light degrades in different aquatic environments. For example, the level of intensity on a reef with clear water will average about 20,000 lux at a depth of 15 feet, and 10,000 lux at 30 feet. Knowing where an organism lives in nature will give you a good idea of the light intensity required to maintain that organism in your aquarium. Lux meters are relatively inexpensive, and can be used to check your lighting for required intensities.
Light intensity at the source is measured in watts. The higher the watts, the more intense the light, and the more energy required to produce the light. A 100-watt bulb, for example, will give off more light than a 40-watt bulb, and will cost more to use. A watt is actually related to a lux. One lux is equal to 1.46 milliwatts (0.00146 watts) of energy of one specific frequency (555 nm) hitting a surface area of one square meter. However, since bulbs used in aquarium lighting systems emit light of many frequencies (not just 555 nm), no exact formula can be used when determining the number of lux produced by a bulb of a specific wattage.
Info Gathered from http://www.liveaquaria.com/PIC/article.cfm?aid=34