I think this thread would be more interesting if people would post the year and led type. More details the better. Your application is important. It is the realization that, hey, we can do things with these lights (never practical before), that the "light bulb" really goes off.
For me, I got flashlights since 1987 every year, but threw them in trunk, where every 3 years, I might need, but the cells were dead. Working nights in 1998-2000, I was happy with my incan keychain squeeze lights (held in mouth)--no need for battery worries, cheap enough to buy a dozen to stash around house, cars, in briefcase, toolbox, glove compartments. CC Crane advertised led lights back then, but still felt no draw to another penlight. An indoor hall job where it was impractical to constantly move fixed worklights, and I paid hundreds in touchup; so, the idea of headlamps for daily use came to mind--but 20 to 40 minutes of useful incan lights hardly makes sense. It was a 2004 or 2005, an NPR newstory on the white led (and for the year 2005 it was overinflated, hype of 10x runtime; which got me interested. Fortunately, Wallymart had the lux1 Brinkman headlamps 3 AAA, which claimed 17 hour runtime (real world was 2h45m to 3 h of useful output). Modifying it to 3 AA with variable resistor, one could get 7 to 12 hours of useful lux! Unfortunately, the getting comparable candela at a similar runtime, was very elusive for years (even with the xr-e generation with any light or reflector I could find-remember, we are talking 12 hours off 3 AA). It never dawned on me that the USA didn't have the best stuff in the stores, until the Brinkman lux 1 was discontinued fall of 2007. I suspected and found cpf, which illuminated the existence of "real" leds that weren't seconds or outdated. Retailers think consumers are dumb. This creates a challenge for people needing max output and runtimes.
Got to love the family members. Never fails, each Christmas, I am still getting huge store lights (usually D cells) with penlight runtime and output.