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I've sold $2m of LED over the last 8 years.
Lumen output is not the way to compare one bulb to another. You need to measure the lux falling onto the objects in the room. Leds are directional which means less lumens required to give the same lux. The purpose of a bulb is not to have you stare directly at it and be blinded...the purpose is to illuminate objects you want to see.
6000k is daylight (literally) so if you prefer 3000k it's because you are used to lousy yellow distorted light which decreases color depth, contrast and perceived brightness.
A T5 does not produce white light, it produces UV (and infrared) which gets converted to white light through the phosphorus (and a great deal of IR and UV escape the tube). This requires a gas to be HEATED. Infrared is the primary wavelength with UV being secondary. Obviously this is very inefficient.
I call bs on 100lm/w.
Leds ARE more efficient because their primary wavelength is already the required wavelength, no lossy conversion is required. No UV is emmited out of the bulb and very little infrared, which is easier on the eyes.
Early leds did produce UV which was filtered through a phosphorus dome. I have not seen these in 6 years, and only at the bottom end of the market. If that's what you want to buy I have no sympathy for you.
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