This ETC Source Four 750 ellipsoidal light comes with a bulb and a 20A 125V plug. However, it does not include a C - clamp or a lens tube. It's a great lighting option for various setups despite these missing parts.

To use this ETC Source Four 750 ellipsoidal light, first, make sure to connect the 20A 125V plug to a suitable power source. Since it doesn't come with a lens tube or a C - clamp, you'll need to use your own if you require them. When handling the bulb, be gentle to avoid breakage. For maintenance, regularly check the bulb for signs of wear and replace it if necessary. Keep the light clean by gently dusting it off. Also, always ensure the power is off before any maintenance work.