Hey, I'm only going by the quoted figures, I'm not familiar with the company. Perhaps you could explain why, as it comes across as a bit patronizing otherwise (which I'm sure is unintended).
It's not just TerraLux. Most flashlight companies measure output at the emitter. That's before the reflector, lens, and head are installed. After they are, output will always be less. Always. Runtime is measured in terms of fully stated output, followed by diminishing but still useful levels of output.
For example: Let's say you have a light rated at 100 lumens. You get that output level for an hour. Followed by 50 lumens for the next 2 hours. Then after that it starts to dip at around 10 lumens for the next 4 hours. Yet, on the package, the manufacturer claims output of 100 lumens (likely at the emitter instead of the realistic measurement using an integrating sphere to get out-the-front lumens numbers) and then will claim a runtime of 3 hours instead of 1. Or, they might even have a runtime of 7 hours printed on the packaging. Meanwhile, you only get full output for only an hour.
That's just an example. Many flashlight companies do that sort of thing. Some are more honest with regards to both output and runtime. The ones that aren't . . . I personally consider their claims to be false advertising. But apparently it's not what the Law considers to be false advertising.
I found out about lumens numbers the hard way. Years ago on the same day, purchased a Streamlight Scorpion and a SureFire G2. Imagine my surprise when the 65 lumen G2 turned out to be considerably brighter than the 114 lumen Scorpion. (And I mean considerably.) Found out later that Streamlight was using emitter lumens for the Scorpion's rating, while SureFire not only gave out-the-front, realistic, numbers; but SureFire is actually known for generally underrating their out-the-front ratings. Meaning, your G2 is guaranteed to put out
at least 65 lumens. But often it, and other SF lights, will produce
more than what's printed on the packaging.
This is just one of the interesting aspects of the flashlight industry you'll learn about on CPF. No one learns everything overnight. (I definitely didn't.) Whatever you see written on the packaging or posted on most manufacturer's website, when it comes to lights, don't take it with just a grain of salt. Sometimes you need to grab yourself a shovel because of how much salt you'll need to heap on those claims.
Despite a lot of the sheer B.S. that exists in the industry, this is a fun hobby. Enjoy it.