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Visible Light
Spectrum of Light Visible to Humans in Comparison to Spectrum of Light Visible to Plants
Multi-Colored Waveform - Spectrum of Light Visible to Plants
Bell Shaped Waveform - Spectrum of Light Visible to Humans
Peak sensitivity of the human eye is approximately 555nm, which is predominantly in the yellow and green color range
High Pressure Sodium lighting appears not to have shadows (when used as a grow light) as your eyes are very sensitive to this color range
High Pressure Sodium lighting is useful in congested urban areas to deter crime
It is often referred to (in this application) as crime a light
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