Larger spot sizes deliver ______ and require ______ energy.

Larger spot sizes deliver deeper penetration into the tissue and require less energy for effective treatment. This is due to the fact that a larger spot size distributes the laser energy over a broader area, which can reduce the intensity needed to achieve the desired therapeutic effect. Consequently, since the energy is spread out, the amount of energy required to reach deeper layers of tissue is less compared to smaller spot sizes, which concentrate energy in a smaller area and can lead to more superficial effects. This principle is fundamental in laser applications, as it impacts treatment planning and efficacy based on the size of the spot being used.