Here's the breakdown:

* Traditional Neon Signs: These require a high-voltage transformer to operate. You cannot simply plug them into a standard wall outlet. They need a specialized transformer to convert household voltage (120V or 240V) to the high voltage required by the neon gas (typically 10,000-15,000 volts).

* LED Neon Flex: These are LED strips that mimic the look of traditional neon signs. They are designed to be plugged into a standard wall outlet using a power adapter.

* Other Neon-Like Lights: Some lights use neon-like bulbs but are designed for low voltage and can be directly plugged into a wall outlet.

In short:

- Traditional neon signs require a transformer.

- LED neon flex is designed for wall outlets.

- Other neon-like lights may be plug-and-play, but check the instructions.

Always check the instructions that come with your light to confirm its power requirements.