Perfect for all applications that require strong UVA (365nm) of electromagnetic radiation. Designed for gel & UV topcoat curing. Note: (1) For optimal curing, bulbs should be replaced every 6 to 12 months, depending on usage. (2) Replacement bulbs for Shellac UV Lamp or similar lamps. Warning:This UV light bulbemits Ultraviolet Radiation at 365nm (UVB). Ultraviolet radiation is harmful to the skin and the eyes and can cause serious skin burns and eye injury either from direct or reflected radiation. Avoid exposure and never look directly at the burning lamp. Hand and eye protection should be worn at all times when handling. This light bulb should not andnever beused for illumination purpose.