Softball rules vary somewhat from those of baseball. Two major differences are that the ball must be pitched underhandâfrom 46 ft. (14 m) for men or 43 ft(13.1 m) for women as compared with 60.5 ft. (18.4 m) in baseballâand that seven innings instead of nine constitute a regulation game.
Many ENERGY STAR certified bulbs come in warm colors to match the yellowish light of incandescent bulbs, but you can also choose cooler colors with whiter or bluer light. Choosing the Right Color: Light color is measured on a temperature scale referred to as Kelvin (K). Lower Kelvin numbers mean the light appears more yellow; higher Kelvin numbers mean the light is whiter or bluer. Most ENERGY STAR certified bulbs are made to match the color of incandescent bulbs at 2200-3000K. For a whiter light, look for bulbs marked 3500-4100K. For bluer white light, look for bulbs marked 5000-6500K.
Kelvin is the SI unit for temperature. Kelvin is a temperature scale based on molecular motion, where 0K is the temperature where all molecular motion stops. 0K is also known as Absolute Zero and is defined by the third law of thermodynamics.