Perfect for use in workrooms, patios, decks and other areas that clean, focused heating is desired. S-Wave high intensity low light radiant heat produced by Solaira, like sunshine, gives warmth you can feel the instant the heaters are switched on. Consider a cool cloudy day that becomes instantly warm when the clouds move and you are in full sunshine. The air temperature did not change but what you are feeling is the shortwave infrared produced by the sun…like Solaira Heaters. This shortwave infrared IS NOT DANGEROUS ULTRAVIOLET (UV) as this is another part of the spectral wavelength produced by the sun.