Sk15 with longer leads non-jacketed infrared heat lamp with gold coating further reduces glare to the eyes compared to ruby lamps and provides instant heat when turned on. It uses short wave infrared technology which converts most of the electrical energy in to heat, with a lifespan of up to 5000h this is one of the most efficient on the market. This makes a perfect patio heater replacement lamp or it can be used for industrial applications including paint drying.