space... those aren't 100w and 150w cfls... they're more than likely closer to 23w and 42w... those bigger numbers are just their equivelants if they were incandescents...
the smaller ones are daylight and are a better spectrum for vegging (though i think they're only like 4500k, there are some that are 6000k) and the bigger ones look to be warmer 2700k ones