There are quite a few these days.
SureFire is one of the older brands. They have the distinction of their products being made in the USA whereas many lights are made in China. They have a very good reputation for reliability and durability. The trade-off to being made in the USA is a notably higher cost than some competitors.
Streamlight has a very good reputation as well and is used by a number of emergency services across the country, both police and fire. Their lights are typically made in China, and as a trade-off are generally very affordable.
Both Streamlight and SureFire have US military contracts IIRC. That matters to some people.
Some options that have gotten more attention in recent years are Inforce and Olight. Again these are made in China. They still have good reputations, though don't seem to be as well thought of as the previous two.
If all you're looking for is a full-size light for home defense then personally I think SureFire or Streamlight is the way to go, though Olight has a similar light called the Valkyrie that produces an impressive amount of lumens. If you're looking for a more compact light for use in a concealed carry holster I think Inforce and Olight have some nice options. I would say for home defense the Streamlight TLR-1 HL is hard to beat. Many of the lights have switches that activate in different ways. Watch some videos of them to see if one switch type in particular appeals to you. Not all lights have the same beam pattern either. Some are more of a spotlight or a flood. Wouldn't hurt to read an article about candela versus lumens if you want to understand the topic better.
When buying any light just check reviews for the level of fakes. On Amazon some sellers will sell fakes. If buying there just check the score of the particular seller before ordering.
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