Simplify the following text for a Grade 3 native English-speaking person.
Original: The term `` neon lamp '' is generally extended to lamps with similar design that operate with different gases . Neon glow lamps were very common in the displays of electronic instruments through the 1970s ; the basic design of neon lamps is now incorporated in contemporary plasma displays .
Simplified: Neon Lamps are used to make neon signs .