We have three, no four Ott lights in teh house. DH just bought one on sale from JA's with free shipping for his desk when doing his homework. Loves it and I have my floor one back for sewing.
I have never used the Ott bulbs in other lights in the house. Too expensive. HOwever, I have had my floor light for over 15 years and have only replaced teh bulb once which was last summer. I don't like the Daylight or other lights that imitate Ott's. I don't believe they are anywhere near the same.
Pay the price and you will not be sorry.