ITC PARwise Perfect growth rates need three things: the correct wavelengths, the correct intensity of light and both of these for the correct amount of time. Light changes with depth and clarity so too does the requirements of plants and animals. Unfortunately, the human eye is not particularly good at understanding light levels and colours! PARwise provides you with a simple to use light meter which will give you a deep understanding of your lighting and how to tune it to perfection. PARwise covers the key areas to ensure successful lighting: P.A.R (Photosynthetically Active Radiation), the real time light energy used for photosynthesis. Spectrum, bias of the light wavelengths, Looking at energy peaks, understand color & CRI D.L.I (Daily Light Intergration), the amount of light in 24 hours plotted on an easy to read graph Can be used wet or dry.