SeedsHereNow - Forum
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What is light? What are waves? Why does it matter.
#1
For our purposes we are defining light as the range of electromagnetic radiation having wavelengths of 100-1000 nanometers (nm). We are actually only really interested in the wavelengths/frequencies between the shortest wavelength/highest frequency of UltraViolet B (UVB) to the longest waves/ lowest frequency of Near InfraRed (NIR). This range is properly referred to as "Photo-biologically Active Radiation (PbAR)." This is because every wavelength in the PbAR range triggers and/or energizes photo-biological activity.

You will commonly see images with the low frequencies of PbAR on the right hand side of the chart. This is because the lower the frequency (number of times per unit of time) that waves are propagated (created) at, the further the front of each wave wave has travelled before the next wave is propagated. There's more to this. The more amplitude/strength. of energy propagates waves, the more frequently (per unit of time) waves are propagated.

In photobiology, light is counted by "mols" of "photons." We will be coming back to mols in a bit but we aren't ready for them, yet. Photons are pretend units. A mol of blue photons does not carry the same amount of energy as a mol of red photons. The more sensible way to measure, although it isn't how it is usually done. would be to count milliWatts or microWatts of energy in specific band widths of wavelengths. One advantage to measuring that way would be the ease of figuring out how many of tour watts of electrical energy from the wall is being converted into light energy, at which wavelengths, is coming out of your lighting.

This is my first stop for questions, if there are any.    
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