I have a photo lamp with two long T4.5 lamps that I couldn't find anymore. The inner diameter of the tube that surrounds the lamp is 0.801 inches, so I took a chance on this T6 size lamp. This lamp was the perfect length and diameter for my fixture despite being rated a T6 size. Here is the size of this lamp: Diameter = 0.772 inches. Overall length 3,504 inches, glass bulb length 2,500 inches. The thread length is 1.3 inches. The thread starts at a distance of 0.6 inch from the plunger tip. These 2 watt bulbs have replaced the 15 watt incandescent bulbs. The color is warm yellow 2700K, like the previous lamps. These bulbs are a bit brighter, more like 20W incandescent bulbs, and we actually like them better than the 15W bulbs. They also don't get hot like the old incandescent bulbs. I hope with these LEDs I don't have to climb 8 foot stairs for a long time!
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