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In the past there have been many studies and manufactures of lightingproducts claiming the output is better for plants and discussing various lightcolor temperatures, spectral outputs, intensities, water absorption characteristics,efficiencies, but few articles dealing with the plant’s ability to adapt anduse the available irradiance for growth. Many aquarist find they can growSAM’s equally well and at similar growth rates using standard cheap cool whitefluorescent light bulbs as well as the expensive specialty aquarium plant lightbulbs. A study done by V.A. Helson Canada Department of Agriculture andJ.W. Bartok and R.A. Ashley showed the relative growth rate (RGR) was thesame and not significantly different using cool white fluorescent light bulbs versusthe special plant light bulbs. Reviewing this research showed the researchwas well done and thorough, the researchers addressed the assumptions theymade and supported their conclusions. My own experience showed a widerange of lighting systems would work equally. Greatest preference is generallygiven to the aquarist own eye’s of true perceived color rather than to RGRmeasurements and other forms of quantitative measurements.
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