Enlarging the M-tube line of LED light tubes are components with 5-mm and 10-mm diameters and lengths up to 2m. Other standard diameters include 6 mm and 8 mm. Light housings come in double-ended or optional single-ended configurations and the end-caps can be swapped with different colors. The light guides are rugged with a strong hard-plastic light bar tube that stays cool even when brightly lit. Colors include Duo LED and RGB variants and flexible color imprinting allows various widths and patterns so that the light can be beamed as a narrow spotlight or spread wide for large-area lighting. ELMA ELECTRONIC INC., Fremont, CA. (510) 656-3400.