From the experience of using lights you learn many different things, and among those there is the fact that the brightest and long throwing light is not always the best choice.
For upclose tasks, where you use your light at a distance of 30 cm. maybe, 50 (true OTF) LED lumens or 30 incandescent lumens at 3200 K are more than enough, distributed in the beam at 70% in a 10 cm diameter hotspot, 10% in the corona, and the remaining 20% in the spill.
With this beam configuration, you can do everything, from electronic soldering to emergency surgery. As a source, think of a Seoul P4 driven at 0.5 A in a SF KL4 reflector.
If you increase the lumens to 100 (true OTF) you need to move the light at 50 CM distance, loosing your ability to appreciate the shadows and the possibility of evaluating deepness.
For room lighting, and indoor "tactical" use, you need a different beam configuration; to visually "clear" a 5 x 5 meter room, you better have 300 LED lumen (true OTF) distributed 60% in 35 cm. hotspot at 2.5 meter, very little in the corona, and the remaining 40% in the spill. As a source, think of an MC-E LED in a medium-deep reflector, like the OL M30.
For night reading, I mean reading a light in the bed, 15 (true OTF) lumens are more than enough, but... they have to be a sort of directional spill. Even an array of three to five 5 mm. LEDs with 25 degree beam opening will force you to adjust the light as you scroll the page from top to down.
Personally, I have found that an array of 3 uncut MJLED, in a PT Attitude, make the best reading light for myself, as the beam cover evenly all the book.
For outdoor searches, you need a tighter beam, but the spill is very very important. Higher is the beam spill, less is need for a continous scan of the search area, and this increases the probability to find what you are looking for.
At the same moment, a too bright hotspot can temporarily blind yourself, and you may miss what you are looking for.
The profile of the beam for searchlights is something very subjective, as it is strictly related to your search habits, like your scan speed (the speed you scan the landscape with the light, if you are walking or riding a vehicle, if you are in a team or by yourself, if you are using binoculars, and so on).
Personally, a searchlight emitting 1000 (true OTF) lumens, with 70-80% in a hotspot of 30 cm diameter at 10 meters, and the remaining 20-30% in the spill, are my preference for a searchlight. Knowing your numbers helps to make quick and accurate evaluation of distance and speed - just with the use of your light.
These are just few examples of what your experience as flashaholic will eventually bring in terms of knowledge. There is more, as you will certaily discover.
Regards
Anthony