You are innovative - drink 10 more bottles of Schlitz and you can light up your house. You could drink more and make flashlights to give to family for Christmas but you'd better let someone else do the cutting of the Christmas wrap paper.
Schiltz as a brand is long gone, it went from top of the market to an obscure regional rarity, the flashlight is about 42 years old, my oldest flashlight is about 85 years old.
For people who own old, favorite flashlights, the led drop ins are a great idea.
I converted a Tekna II (a popular 1980s 2-AA dive light)to led, and with rechargeables, it self regulates, with a pretty consistent brightness for at least 30 hours, with who knows how many more hours of usable light, I didn’t want to damage the batteries so I counted 30 hours as sufficent for my personal test.
Since yesterday I have been running a Lightwave 3000 which is a 4 led flashlight from about 2000/2001, old but high quality technology and build for it’s time, with rechargeables, and 22 hours in on the test, it looks good so far, they say that it will produce usable light for 2 weeks with never being turned off.