LED Placement (image) The Optical Society Share Print E-Mail Caption Researchers designed a train headlight that uses two half-circular parabolic aluminized reflectors containing high-efficiency LEDs (a). The placement of each LED in the upper reflector is shown in (b). (c) shows Illumination patterns corresponding to LEDs 1 to 5 arranged as in (b), demonstrating the individual and combined illumination areas from five LEDs in the upper reflector. When used together the two reflectors form a circular illumination pattern. Credit Wei-Lun Liang, National Taiwan University Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.