02-08-2007, 08:29 PM
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The amount of wattage is not the key to keeping healthy plants. More important is the selection of plants that can survive with the amount of light provided. Also more important than intensity is "sprectoral diversity". Spectoral diversity can best be described as the imitation of natural light in the aquarium or how close can one match the amount, both in intensity and spectrum, to the light the plants receive in their natural habitat. Intensity will be measured in lumens and the lights should be labeled as to the end of the spectrum they are producing. Cool white bulbs, for instance, produce light toward the blue end of the spetrum, while warm white bulbs are producing light toward the red end. Gro-lux bulbs have a wider range of emmitance of the spectrum. Wattage is nothing more than the rating to show the efficiency of a given light bulb. Efficiency can be shownby dividing lumens by watts,the higher the number, the more efficient the bulb.