Review on OttLite T18330 Replacement Tube Bulb by Reza Cook

I have had 2 Truecolor Ott-lite lamps for many years and one of them eventually burned out. I first bought a replacement bulb, model T18330, which to the naked eye looks exactly like my old bulb. Although it looked correct, it didn't match the lamp. It was a tiny fraction of an inch too big and I broke the bulb trying to fit it. I chose this one as the description said it was for the Truecolor Flex Arm Ott-lite and I was delighted when it matched the lamp perfectly. The box says the model number for this replacement bulb is T24J3B, P/N 237346. I've just bought 2 more of these to have on hand if another bulb burns out in a few years. Now it was difficult to find the right replacement lamp, so I fear that in 10 years it will be even more difficult to find the right replacement lamp.