I have a recipe for chocolate pudding that calls for Light Cream. I haven't ever seen light cream in the store. What is it? Also what can be used as a substitute?
This is somewhat regionally-dependent. You'll want to take into account where your recipe is from.
In the U.S., light cream is 18% fat (although, officially it can be anywhere from 18-30%). It is equivalent to table cream in Canada and single cream or just cream in the UK. I believe it is also sometimes referred to as table cream or coffee cream in the U.S.
The term is in contrast to heavy cream (also known as double cream or whipping cream in some regions) which is 36% fat.
In Canada, light cream actually refers to 5-6% "low-fat" cream, and seems to be used most often as a coffee creamer. This particular type of cream doesn't seem to be popular anywhere else.
See the Wikipedia page on cream for more detailed comparisons and terminology from other regions.
Light cream is usually full cream with some (up to most) of the fat removed (and usually gum and other stuff added to simulate the texture and other properties of full cream). You should be able to substitute with the same amount of full cream.