Student or Learner
What is the difference between
1) Is there a light in the basement?
2) Is there light in the basement?
1) Artificial light
2) Natural light
Not a teacher.
I would say that a light is the source, and that light is the product.
Pls, take a look at Cambridge Dictionary definitions:
Light:[ U ] the brightness that comes from the sun, fire, etc. and from electrical devices, and that allows things to be seen
[ C ] a piece of equipment which produces light, such as a lamp or a light bulb