Gallery: The Top 10 Strains of 2015

From High Times:  The Official High Times Field Guide to Marijuana Strains reveals his choices for the most fragrant, flavorful and potent pot varieties of the year! Read More From High Times:

What is PAR and How Does It Affect Grow Lamps?

From High Times:  PAR stands for photosynthetically active radiation, and refers to all the wavelengths of light between 400 nm (violet, blue) and 700 nm (deep red). Read More From High Times: