6 panel interior doorsis the door type on the market. They are light and can be very elegant in appearance. One of the deficiencies of hollow core types is that they are not soundproof. Noise will filter through the hollow core.
6 panel interior doors are more than a hollow core but less of a door that is sturdy. Solid core doors generally have a veneer exterior as well. They are much heavier and a bit more work to install. They are also proof then the core hollow. Solid doors are also even more expensive and heavy. They can be dyed, varnished or painted and come in all wood varieties.
Some 6 panel interior doors start trimmed. It saves time, energy and money. If is not trimmed, you may want it pre-trim it first and to buy a casing for it. This makes installation quicker and easier. You need to make some decisions, before buying this door. With where the lights are located, most individuals make this decision. It will make it difficult to turn on the lights, when the swing is opposite to the lamp.