Ott lights only supply bulbs for a limited time after they quit making the lamps. I ran into problems with this on one of my older Ott lights. My husband was able to make the bulb fit (Ott told me it would fit. It didn't) so I got lucky. I bought a Stella lamp that I got a deal on. If it works out long run, I"m buying those from now on. They're pricey but I really like my Stella lamp. Much better than my Ott lights.