LED light tube replaces a fluorescent light mounted in a fluorescent light fixture. Main power is feed only to the first socket end mount of the fluorescent fixture. The LED light tube includes an elongated tubular structure substantially the size and length of the fluorescent light tube and extends between the first and second end mounts of the fixture. Within an end region of the tubular structure and adjacent the first tube end mount, an internal power supply converts the main line power to LED bank power. The tubular structure of the LED light includes an elongated semi-spherical substantially transparent top cover mounted atop a printed circuit board substrate. The substrate supports a plurality of LEDs thereon.