A lighting system for an interior space of a refrigeration cabinet having at least one glass door supported by a door frame, the lighting system comprising: at least two light modules electrically coupled to each other, each light module being mechanically coupled to the door frame adjacent a periphery of the glass door; each light module including: a printed circuit board; a series of LED sets mounted on the printed circuit board, each LED set including two or three LEDs connected in series, wherein each LED is configured to generate light across a projection angle, each LED set being connected in series or in parallel with the other LED sets; a driver mounted on the printed circuit board and operably coupled to the series of LED sets, the driver including: a plurality of capacitors connected in parallel and configured to provide a limited current; a diode bridge receiving the limited current and configured to provide a rectified current signal; and a linear preprogrammed integrated circuit including a resistor receiving the rectified current signal and configured to provide a regulated supply of direct current to the series of LED sets; a housing defining an interior chamber configured to receive the printed circuit board with LEDs and driver, the housing defining a base portion and a diffusion portion, the diffusion portion including a transparent wall formed with a number of diffusion lines sufficient to diffuse light from the LEDs across a projection angle, wherein the housing mechanically engages the printed circuit board thereby to thermally couple the housing to the LEDs; and a pair of caps sealingly coupled to opposite ends of the housing to hermetically seal the housing interior chamber, each cap being configured to allow electric conductors operably connected to the printed circuit board to pass therethrough. at least two light modules electrically coupled to each other, each light module being mechanically coupled to the door frame adjacent a periphery of the glass door; each light module including: a printed circuit board; a series of LED sets mounted on the printed circuit board, each LED set including two or three LEDs connected in series, wherein each LED is configured to generate light across a projection angle, each LED set being connected in series or in parallel with the other LED sets; a driver mounted on the printed circuit board and operably coupled to the series of LED sets, the driver including: a plurality of capacitors connected in parallel and configured to provide a limited current; a diode bridge receiving the limited current and configured to provide a rectified current signal; and a linear preprogrammed integrated circuit including a resistor receiving the rectified current signal and configured to provide a regulated supply of direct current to the series of LED sets; a housing defining an interior chamber configured to receive the printed circuit board with LEDs and driver, the housing defining a base portion and a diffusion portion, the diffusion portion including a transparent wall formed with a number of diffusion lines sufficient to diffuse light from the LEDs across a projection angle, wherein the housing mechanically engages the printed circuit board thereby to thermally couple the housing to the LEDs; and a pair of caps sealingly coupled to opposite ends of the housing to hermetically seal the housing interior chamber, each cap being configured to allow electric conductors operably connected to the printed circuit board to pass therethrough. a printed circuit board; a series of LED sets mounted on the printed circuit board, each LED set including two or three LEDs connected in series, wherein each LED is configured to generate light across a projection angle, each LED set being connected in series or in parallel with the other LED sets; a driver mounted on the printed circuit board and operably coupled to the series of LED sets, the driver including: a plurality of capacitors connected in parallel and configured to provide a limited current; a diode bridge receiving the limited current and configured to provide a rectified current signal; and a linear preprogrammed integrated circuit including a resistor receiving the rectified current signal and configured to provide a regulated supply of direct current to the series of LED sets; a plurality of capacitors connected in parallel and configured to provide a limited current; a diode bridge receiving the limited current and configured to provide a rectified current signal; and a linear preprogrammed integrated circuit including a resistor receiving the rectified current signal and configured to provide a regulated supply of direct current to the series of LED sets; a housing defining an interior chamber configured to receive the printed circuit board with LEDs and driver, the housing defining a base portion and a diffusion portion, the diffusion portion including a transparent wall formed with a number of diffusion lines sufficient to diffuse light from the LEDs across a projection angle, wherein the housing mechanically engages the printed circuit board thereby to thermally couple the housing to the LEDs; and a pair of caps sealingly coupled to opposite ends of the housing to hermetically seal the housing interior chamber, each cap being configured to allow electric conductors operably connected to the printed circuit board to pass therethrough.