What is the definition of "Light" when used on a food label?

This descriptor can mean two things:

First, that a nutritionally altered product contains one-third fewer calories or half the fat of the reference food. If the food derives 50 percent or more of its calories from fat, the reduction must be 50 percent of the fat.

Second, that the sodium content of a low-calorie, low-fat food has been reduced by 50 percent. In addition, "light in sodium" may be used on food in which the sodium content has been reduced by at least 50 percent.

The term "light" still can be used to describe such properties as texture and color, as long as the label explains the intent-for example, "light brown sugar" and "light and fluffy."