The Need Is Your Lead. And Sometimes The Need Is Hidden. Other Times, It's A Low-Threshold Need. Haven't Yet Reached Your Bother and Annoyance To Act And Work On It.
Example: The HandyLight. For The Handyman. Repairman. Never Have Encountered an Handyman With Good Lightning. Or If So, Their's Light Are Bulky And Cord Plugged In. Was Looking For A Good Flashlight. Found This Long-Range Flashlight, Work Light, Lantern, Spotlight All-In-One Combo. Perfect Portable Light. A Handy 'n Hang Light! For Under The Sink, Car, Or Where There's No Light.
Regular Incandescent Light Bulbs Are Higher Temperature, Less Bright, Less Efficient, and Shorter Life.
LED Lights Are Lower Temperature, More Brighter, More Efficient, and Longer Life.
100W Regular Light Bulb = 20W LED Light. Both Gives Same The 1600 Lumens of Brightness.
What Is Lumens And Candelas? See The Graphic Definition Below.
The Candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 × 10^12 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian.
The Candela Is The Base Unit of Light Intensity (Brightness) Given Out By A Typical Candle In A Single Direction. 1 Candela Is About A Candle's Light.
Candela First. Then Lumens Second.
Lumens Is Defined From The Candela Base Unit. It's The Total Watt Power Output From the Light Source In All Directions (i.e. The Enclosing Sphere). For Reference, A 100W Light Bulb = 20W LED Light. Both Gives Out The Same 1600 Lumens. So LEDs Are Much More Power Efficient, Operate At A Lower Temperature, And Longer Life Too....
Ref:
https://www.amazon.com/Rechargeable-Flashlight-Capacity-Portable-Emergency/dp/B09CPSJTN5
https://www.conservationphysics.org/lightcd/light_cd.html
https://www.batteryequivalents.com/candela-vs-lumens-what-is-the-difference.html
https://www.ledwatcher.com/light-measurements-explained/
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