Deadspin's ranking of 24 light beers:
LINK
Here's my own ranking of some of them:
1. Amstel Light, 95 calories, 3.5 percent ABV
2. Beck's Premier Light: 64 calories, 2.3 percent ABV
3. Corona Light, 99 calories, 4.1 percent ABV
4. Sam Adams Light: 119 calories, 4.3 percent ABV
5. Heineken Light, 99 calories, 3.2 percent ABV
6. Bud Light Lime, 116 calories per 12 ounces, 4.2 percent alcohol by volume
7. Coors Light, 102 calories, 4.2 percent ABV
8. Molson Canadian Light: 120 calories, 3.9 percent ABV
9. Miller 64, 64 calories, 2.8 percent ABV
10. Bud Select 55, 55 calories, 2.4 percent ABV
11. Bud Light, 110 calories, 4.2 percent ABV
12. Michelob Ultra: 95 calories, 4.2 percent ABV
13. Michelob Light, 122 calories, 4.3 percent ABV
14. Busch Light, 95 calories, 4.1 percent ABV
15. Natural Light, 95 calories, 4.2 percent ABV
16. Miller Lite, 96 calories, 4.2 percent ABV
17. Keystone Light, 104 calories, 4.1 percent ABV
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Haven't tried, or can't remember these (w/ Deadspin's ranking):
18. Sapporo Light, 119 calories, 3.9 percent ABV
12. Genny Light, 100 calories, 4 percent ABV
11. Bud Light Platinum, 137 calories, 6 percent ABV
9. Medalla Light, 83 calories per 10 ounces, 4.0 percent ABV
7. Mich Ultra Lime Cactus, 95 calories, 4 percent ABV
3. Labatt Blue Light: 108 calories per 11.5 ounces, 4 percent ABV
2. Kirin Light: 95 calories, 3.3 percent ABV