Lennox UV Replacement Bulb (Y0391) for UVC 41W-SD System by Lennox

Order received. Packaging was impressively secure and professional. Clearly a genuine Lennox bulb, with the green tip and stamped "Made in Hungary" like the ones that came with the system my HVAC contractor installed. I got the Lennox "Healthy Climate" UV-C system to combat the "dirty sock" smell my heat pump produces during the defrost cycle. The system as installed by my contractor did the job, with the smell gradually dissipating over the course of a couple weeks and then disappearing. When it was time to change bulbs, I tried to save a few bucks (OK, many bucks) by buying no-name "Made in China" bulbs made to fit my system, for about $20/bulb (from a competitor, not Atomic Filters!). They looked fine and lit up when I installed them, but the dirty sock smell came back. So I bought these genuine Lennox bulbs from Atomic Filters - 4x as expensive as the Chinese bulbs but half the price my HVAC contractor sells the Lennox bulbs for, and I am pleased to report that they are doing their job and the dirty sock smell is gone. Lesson learned - buy these genuine Lennox bulbs, not the cheap worthless knock-offs.