2-ft. 85-Watt LED Adjustable Full Spectrum Grow Light with Auto-Timer

Growing from seeds. How high above seeds does this 85 watt unit need to be? Is there a height chart for this unit?
24-30 inches above seedlings or vegetative stages. These are recommendations and the flower will "speak" to the end user on how much light it will need and spacing as we don’t know the environment these are in, like how big the plant is, the soil they are using, water, pot, etc.  
Does this fixture emit uv?
Our LED grow lights produce light in a visible spectrum; they do not pose a UV risk.
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