Have to say the evolution in LEDs has been pretty amazing. First we had terrible yellow fragile maglites that requires several large C or D cells for anything

Have to say the evolution in LEDs has been pretty amazing. First we had terrible yellow fragile maglites that requires several large C or D cells for anything approaching reasonable brightness and battery life. I had my small maglite die at the bottom of the grand canyon, and the top of MT shasta. After trying to replace a tiny incandescent bulb in the dark in challenging conditions I decided I was switching to LEDs, no matter what the compromise was. Similar monitors had broad spectrum CFLs that generated UV, converted it to white light with a phosphor then threw away most of the light and filtered it down to approximately R, G, and B. The resulting color accuracy was terrible. LEDs started out expensive, not very bright, and mostly red. Migrated to different colors, I think blue was the most expensive. Finally white LEDs started showing up in tiny AA or AAA flashlights with 50-75 lumens. About as bright as the 2xAA maglite that were huge in comparison. Color coverage got better, life got better, efficiency started ramping up. 100-200 lumen flashlights started to become more common. 18650s that have substantially more power and a more LED friendly 3.7V started to appear. Year or two later 400-500 lumens were common, efficiency kept increasing. Started to appear as backlights, car dash boards, brake lights, etc. CFLs switched from wasting 95% of the light to ditching the white phosphors for a mix of RGB phosphors. The savings were twofold and multiplicative. The first was generating UV -> RGB directly with mix of RGB phosphors in the CFL. Then additionally instead of narrow notch filters that didn't pass much light they switched to very wide spectrum filters that passed most of the light. So a red pixel didn't need to be within 1% of red, but instead just block 99% of G and B. Since the RGB phosphors emitted very close to the ideal frequencies the color accuracy increased. Monitor power requirements dropped significantly.... only to be killed off by more efficient LEDs. Things doubled again, small ish flashlights much like the 2xAA maglites except fatter. 1000 lumens hitting $50-$100 points points. Now throwing a usable light 300 Meters isn't unusual from a small hand held light. Depending on your use recharging once a month isn't unusual. 4-or 5 light levels are common, and runtimes of 1.5 hours (max light) to 100 or more hours (on low) aren't uncommon. So now macbook pros that are extremely thin (greatly helped by very tiny LEDs for backlights) get 10 hours of battery light with 500 nit screens with wonderful color accuracy. Similarly even 55" LED screens are crazy high resolution and crazy cheap. The cost per pixel doesn't seem on that crazy different than the cost per transistor. Sadly like Moore's law, LEDs aren't getting much better anymore. For the first time I purchased a new flashlight after 2-3 years... and the best I could find was zero % brighter 8-(. It's not just computers that have been improving like crazy.