Thinking about explaining LEDs to my granny

My granny used to know exactly which light bulb to buy for each room in her house: you used 100Watt for the standard lamp in the sitting room; 40Watt for bedside table; 60Watt for corridors; and got a man in to do the fluorescent tubes in the kitchen. When you left a room you turned the lights out and sometime the lamp shade got a scorch mark where the hot bulb had burnt it. A whole other area of confusion existed because there could be two circuits in the house - the one for lamps with small round pins - and the one with big round pins - and the square pins. So, it wasn't really a simpler time, just one where there was a shared understanding that the bigger the number on the bulb the bigger the plug the brighter the light and the hotter it got if you left it on (so, remember to turn the lights off!!!).
Now, if I had to explain to my Granny which lamp she needs to read her paper I am going to have to start sharing the vocabulary of Lumens - "What Watts?", I imaging her saying, "Not Watts really", I reply, "LEDs don't need many of them to get a similar result. So if you think that your 60Watt bulb in the corridor is giving out about 800 Lumens if you used an LED bulb you would need one that used about 15Watts. "I could see to read with a 15Watt bulb... you're not talking about those energy saving bulbs are you; Mavis got some in the supermarket for 10p each. They are rubbish..." hummmm