Well rongmtek, you sent me scurrying to Wikipedia to see if my wife who worked at Miller was wrong. I’ll do the cut ‘n paste thing but it too said that it got it from Meister Brau.
Essentially the first mainstream light beer, Miller Lite has a colorful history. After its first inception as "Gablinger’s Diet Beer," which was created by the Rheingold Brewery in New York in 1967, the recipe was literally given by the inventor of the light beer process to one of Miller’s competing breweries, Chicago’s Meister Brau, which came out with the Meister Brau "Lite" brand in the late 60’s. When Miller acquired Meister Brau’s labels the recipe was reformulated and relaunched as "Lite Beer from Miller" in 1975, and heavily marketed using masculine pro sports players and other macho figures of the day in an effort to sell to the key beer-drinking male demographic. Miller’s approach worked where the two previous light beers had failed, and Miller’s early production totals of 12.8 million barrels quickly increased to 24.2 million barrels by 1977 as Miller rose to 2nd place in the American brewing marketplace. Other brewers responded, especially Anheuser-Busch with its heavily advertised Bud Light in 1982, which eventually overtook Lite in 1994. In 1992 light beer became the biggest domestic beer in America.