Dialight Corp. has unveiled the 559 series snap-in LED panel-mount indicators, including the daylight-viewable versions, which are available in red, green, yellow, orange, blue and white. They require current-limiting resistors and operate in the 2.1- to 3.5-VDC range. The series also includes the 5- and 12-V versions with integral resistors, which come in red, green and yellow. Bicolor indicators are available in red/green and in yellow/green combinations and include a three-leaded version. The low-current, high-efficiency models come in red, green, yellow and orange with low-current/diffused, high-efficiency/ diffused and high-efficiency/non-tinted/nondiffused LEDs. The indicators typically provide 100,000 h of service. The mounting hole size ranges from 0.249 to 0.252 in.