A tubelight is a layman's term for a fluorescent tube lamp in South Asia. Will an American reader understand that this is what I am talking about if I state, "the store was lit by a single flickering tubelight"?
Fluorescent lights are similar to neon devices. Like neon lights, a very carefully controlled electrical current enters the light and arcs from one end of the bulb to the other, passing through a gas on its way. However, the gas used in fluorescent lights has no neon.
If you want to be really specific (fluorescent lights can be tubes or lights or lamps), the term fluorescent tube (light) is definitely used. Wikipedia starts its article on Fluorescent Lamp by stating:
A fluorescent lamp, or fluorescent tube, is a low-pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light. An electric current in the gas excites mercury vapor, which produces short-wave ultraviolet light that then causes a phosphor coating on the inside of the lamp to glow.
Skillfully milled from a single piece of Carrara marble and finished at each end with brass or chrome bands, Tube contains a strip of LED bulbs resulting in what appears to be a solid length of warm glowing stone. The unique veins of each piece of marble mean no two lights are exactly the same. A handcrafted twist on the traditional fluorescent tubelight.