This ETC Source Four 750 ellipsoidal light comes without a bulb and a C - clamp, but it has a stage pin. Key fact: no bulb or C - clamp is included.

To use this ETC Source Four 750 ellipsoidal light, first, you'll need to get a suitable bulb and a C - clamp separately as they're not included. Connect the light to the power source using the stage pin. When positioning the light, make sure it's stable. As for maintenance, keep the light clean and check the stage pin regularly for any signs of wear. Avoid exposing the light to excessive moisture or dust. If you notice any issues, stop using it and have it checked by a professional.