This ETC Source Four ellipsoidal light comes with a stage pin plug and a bulb, but a C-clamp is not included.

To use this ETC Source Four 750 19 Degree Ellipsoidal Light, first connect the stage pin plug to a suitable power source. Then, you can start using it to light up the stage. Remember, this light doesn't come with a C - clamp, so if you need to secure it, you'll have to get one separately. When it comes to maintenance, make sure to turn off the power before replacing the bulb. Also, keep the light clean by gently wiping it with a dry cloth regularly. Avoid using harsh chemicals as they may damage the light. If you notice any issues with the power or the light output, stop using it immediately and check the connections or consult a professional.