An energy saving device for an
LED lamp mounted to an existing fixture for a
fluorescent lamp where the
ballast is removed or bypassed. The LEDs are positioned within a tube and electrical power is delivered from a power source to the LEDs. The
LED lamp includes means for controlling the delivery of the electrical power from the power source to the LEDs, wherein the use of electrical power can be reduced or eliminated automatically during periods of non-use. Such means for controlling includes means for detecting the level of
daylight in the illumination area of said least one LED, in particular a
light level photosensor, and means for transmitting to the means for controlling relating to the detected level of
daylight from the photosensor. The photosensor can be used in operative association with an on-off switch in power connection to the LEDs, a
timer, or with a computer or
logic gate array in operative association with a switch,
timer, or
dimmer that regulates the power to the LEDs. An
occupancy sensor that detects motion or a person in the illumination area of the LEDs can be also be used in association with the photosensor and the computer, switch,
timer, or
dimmer, or in solo operation by itself. Two or more such LED lamps with a computer or
logic gate array used with at least one of the lamps can be in
network communication with at least one photosensor and / or at least one
occupancy sensor to control the power to all the LEDs.