Aspectek UV Tube 10W 2-Pack Replacement 20W Electronic Bug Zapper Light Bulb&hellip; QuantilyThe pack comes with 2 light bulbs, each 10W SuggestAnnual replacement is recommended for optimal efficiency SizeThe light bulbs are approximately 13 inches in length FitsReplacement UV light bulbs for Aspectek bug zapper 20W installationThe bulbs are designed to be easy to replace and use