This ETC Source Four ellipsoidal light comes without a bulb and has a stage pin. Known issue: it hasn't been tested with a bulb.

To use this ETC Source Four ellipsoidal light, first, you need to install a suitable bulb. Connect it to a power source using the stage pin. Remember, this light hasn't been tested with a bulb, so choose a reliable one. When it comes to maintenance, always turn off the power before handling the light. Keep it clean by gently wiping it with a soft cloth. If you encounter any problems, check the bulb and connections first.