Lennox UV Replacement Bulb (Y0390) for UVC 24V System This is a Lennox Healthy Climate standard replacement lamp for the UVC-24V. For best results, you should change the bulb yearly. 22 Watt Bulb – 16″ Long – Ozone Free!4-Pin Lamp with Blue Tip NOTE: UV Systems covered under warranty – but the lamps themselves are not …