A voltage regulator has an error amplifier circuit, and a phase compensation circuit having a capacitor connected in parallel to first and second series-connected resistors. By this configuration, brittleness of the support part is improved and loss of vibration energy from the support part is reduced and also loss of vibration energy resulting from surface roughness of a surface of the vibrator can be reduced, so that a resonator having a high Q value can be provided. An upper cover serves as a light reflector when the lamp is in use, and may serve as a cover positioned at or near the work surface when the lamp is stowed. The computer provides a configurable product model and enables preview and automatic or user-guided customization of the product model. The red ink includes an effective amount of a red pigment having a predetermined redgreen lambda cutoff, and the magenta ink includes an effective amount of a magenta pigment having a predetermined redgreen lambda cutoff that is substantially similar to the predetermined lambda cutoff of the red pigment. Fluids mixed and dispensed through applicator.