Kelvin: This denotes the color of the bulb. The higher the Kelvin the more bluish it is and the lower it is the more reddish it is. Most aquarists use bulbs between 5000K and 7000K.
Kelvin: A temperature reading used to rate the color of light bulbs. 5500 degrees K is equal to sunlight.
Kelvin - Scale used to measure the color of light
Medium Base - E26 base, similar to household incandescents
MH - Metal halide ...
Kelvin temperature (Light color)
White light can have different "warmth". A bit more red/yellow and white light appears "warmer". A bit more blue and light appears "cool".
K - Kelvin - Temperature scale used to designate light intensity. For freshwater 6400K-10000K is optimum. For marine 6400K - 20000K is optimum.
Spectrum and Kelvin rating is important for tank health and asthetic purposes.
-- Author: fishfanatic2
In a pinch, aluminum foil can be used as a reflector until another can be acquired.
Color Spectrum or Kelvin
The term Kelvin designates the color spectrum of the light bulb. A "full spectrum" bulb is anything between 5000k and 6500k.
Notes about charts All Halides are 175 watt coralife 5500 kelvins. Timer values are what I tryed to set the timers to. Real values are actual time values.
The commonly used unit of measure to measure the spectrum or "temperature" of light is called degrees Kelvin (K). Kelvin is a scale that has been developed to describe the color of light.
As to what Kelvin rating creates the best growth for plants, that's not the measurement you want to look at.
This is not another high brow discussion of PAR, PUR, Lumen, LUX, Kelvin, but a practical path through the forest of technicality. The cheapest cost efficient lights available to us today are the florescent lights.
A: If you are using fluorescent lighting, the lifespan ranges from 12 to 16 months, depending on the wattage and Kelvin temperature of the bulb.
the spectrum of lighting is also important, freshwater tanks use anything up to 6500 kelvins, but a marine tank will suffer massive algae and look washed out with such a yellow light, marine tubes are generally 10, ...
Colour is measured in terms of colour temperature, denoted by the K (Kelvin) rating.
Noon sunlight (above water) is about 5800K, which is slightly yellow.
As the K rating goes down, the colour becomes more yellow, then orange, then red.
Many bulbs are rated in Kelvins. This measurement indicates the temperature a theoretical black body would have to be heated to in order to glow at a particular spectrum.
The next issue with aquarium lighting is the various terminology used in the hobby, such as color temperature measured in kelvins, color rendering index (CRI), photosynthetically active radiation (PAR) and lumens.
Light is a very powerful catalyst though and with warm ligthing (low Kelvin degree range) and nutrients in the water, tons of algae will grow. Cutting the lighting may reduce algae growth but does not deal with the root of the problem: the nutrients.
Metal Halide lamps typically range from 175-1000 watts and have Kelvin ratings from 5,000° to 20,000°. This type of light is closest to the sun in terms of luminousity but they are very expensive to buy, operate and replace.
For all fluorescent lights (N.O., V.H.O., and power compact) and metal halide lights, bulbs are available in spectrums identified by a "K" number which signifies a temperature on the Kelvin scale.
Technically, a bulb's color is rated by temperature (Kelvin) . The higher the temperature of a bulb, the bluer its light will be. A bulb rated at 5000K is the color of midday sun, whereas a bulb rated 10,000k is very blue.
I'm not going into detail about this here but I would like to point out that Kelvin is almost as useless as wattage.
If they get too tall, try brighter lighting, as plants tend to grow as if they were stretching for light. Halides and high-kelvin halogen lights will suppress the plant and force it to grow fuller and not upward.
Since there are so many sizes of PC, ranging from small 9 and 13 watt bulbs all the way up to 65 and 96 watt bulbs. One can use the smaller sizes of PC fixtures to light an algae refugium. Yet not sacrificing Kelvin rating as with smaller lower watt ...
 See also: Water, Lighting, Color, Aquarium, Temperature
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