Is UVC light visible? No UVC light is not visible. BlueMarble Technologies adds a faint blue glow on the LEDs to show that they are on. By admin|2022-05-09T12:30:21+00:00April 6, 2022|faq|0 Comments Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInWhatsAppTelegramTumblrPinterestVkXingEmail About the Author: admin Leave A Comment Cancel replyComment Save my name, email, and website in this browser for the next time I comment.