What says tubelight in sanskrit?

There isn't a direct equivalent of "tubelight" in Sanskrit. The word "tubelight" is a modern invention, and Sanskrit is an ancient language.

However, you could describe a tubelight in Sanskrit using descriptive words:

* दीप्तिप्रद नलिका (dīptipradaya nalikā): This translates to "light-giving tube," emphasizing the function of the tubelight.

* दीर्घप्रकाशक नलिका (dīrghaprakāśaka nalikā): This translates to "long light-emitter tube," highlighting its elongated shape and light-emitting property.

Ultimately, the best translation would depend on the context and the specific nuance you want to convey.