Prepare to lose an hour (or more) of your time today because you are about to drop down a gear-laden rabbit hole. Paramatrek.com is a gear search engine that allows users to search for specific gear by entering the parameters that they desire. The website has search engines set up for a number of different gear items like sleeping bags, sleeping pads, multitools, and more. They are all great but the one I have found most useful recently was the flashlight search.
I was looking for a flashlight that could serve as a compact spotlight around JTT HQ. It was easy to enter the candela numbers I wanted (measure of beam intensity), the battery type and number I prefer, and select the output. That is just scratching the surface of the available parameters (there are 24 in total). As you add or change parameters, the list of matching lights updates in real time.
This is a very powerful tool that puts a lot of information at your fingertips and allows you to make apples-to-apples comparisons very quickly. The databases appear to be kept up to date in a very timely manner and there are a ton of brands represented.
Check out Parametrek.com.