5K to 10K is a good range. Many people find ~6.5K to be a good compromise. The temperature is the measure of how the light appears to the human eye. The plants use specific light wavelengths for certain biological functions. How much of specific wavelengths a given light bulb produces is commonly represented by a "spectrum" chart.
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Courtesy * Integrity * Perseverance * Indominable Spirit * and Self Control
Tenets of TKD