What does it mean when a holiday is all inclusive light?

Basically you get drinks from a start time in the morning to a stop time in the evening E.g 10.00am to 11.00pm. Not 24hrs.

also food is breakfast lunch and dinner .

Any food you require between these sittings you would have to pay for.

E.g Pizza or ice cream.

So in a nutshell its not 24hrs food and drink.