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This economical shortwave ultraviolet fluorescent lamp now also includes a longwave ultraviolet LED lamp so you can experiment with both shortwave and longwave ultraviolet light. Shortwave ultraviolet light is just the right wavelength to vibrantly illuminate many fluorescent minerals that you collect. Some minerals fluoresce, or glow, under shortwave ultraviolet light, others under longwave ultraviolet light, and others fluoresce differently under both!
This one economical, portable provides both shortwave and longwave light, making it a good investment for a rock collector. This lamp produces fluorescent shortwave light at 4 watts and 254nm wavelength and it produces LED longwave light at 375nm wavelength. You provide four AA batteries.
Note: UV light is the part of sun light that causes sunburns. Never look directly at UV bulbs. Wear UV filtering goggles or glasses if using this low-level ultraviolet light source for extended periods.
Quick Science Investigation: Are you wondering if your safety goggles, sunglasses, or regular glasses will help protect your eyes against low-level ultraviolet light like our battery-operated UV lights? Many of these types of glasses have lenses made out of polycarbonate, a natural low-level UV light filter. Test your goggles or glasses by first shining a UV (shortwave or longwave) light on a mineral or other object that fluoresces brightly. Then put the UV lamp inside the goggles or glasses and shine it on the same fluorescing object through the lens. What happens? The object will no longer fluoresce where the UV light has been filtered by polycarbonate lenses!