This ETC Source Four ellipsoidal light comes without a bulb. It features an Edison plug and is equipped with a C - clamp. Please note that a bulb is not included.

Using this ETC Source Four ellipsoidal light is easy. First, find a suitable place to install it and use the C - clamp to secure it firmly. Then, connect the Edison plug to a proper power source. Remember, you'll need to buy a compatible bulb separately as it's not included with the product. When it comes to maintenance, keep the light clean and free from dust. If there are any issues with the C - clamp or the plug, check for loose connections. Also, always make sure to turn off the power before any inspection or replacement work to avoid electrical hazards.