You can buy depth stops to attach to drill bits to make blind holes at a certain depth. But for occasional jobs you can gauge depth by using masking tape around the bit at the right depth. Or, as shown, drill through the center of a dowel section, using the bit you need for the hole. Cut the dowel so the exposed bit will be the depth needed for the hole.
High-color-rendering fluorescent bulbs can enhance artwork. The color rendering of a light source describes the ability to accurately render the colors of perceived objects and people. Generally, the higher a light source’s Color Rendering Index (CRI) number, the better the lamp will make things appear.