The PureLED System

Truly the heart of the Pure LED system is Hunza’s Plug-and-Play circuit board that allows the LED to easily be unplugged and replaced in the field. The unique design delivers maximum performance from the market-leading Cree LED chips and, in the event of an LED problem, the Plug-and-Play feature allows easy replacement or upgrade of the LED chip.

You can see from the diagram how the LED board is secured to the electronics “pot” underneath the machined aluminium heat sink. The two screws serve a dual purpose, ensuring secure installation of the board, while also acting as the contacts for conducting the electrical current.

The LED board has a coating of a special compound on the underside surface to maximise heat-transfer efficiently. The aluminium heat-sink fits snugly inside the fixtures body, so heat is transferred quickly and efficiently away from the LED chips. This system enables Hunza to obtain maximum light output from the LED without compromising the life of the component.

Hunza includes advanced protection circuitry in 6W and 4W Series version PureLED light engines to help guard against damage from incorrect wiring and simplify the task of identifying a failed LED.

Each of these light engines include a removable “series pot” plugged into the back of the fixture, which houses a circuit board.

This board carries the necessary wiring and components to deliver power to the LED chip. However, it also includes additional components to protect the system and simplify maintenance.

One of these components is called an LED shunt, which diverts power around the LED chip, should it fail for any reason. Normally a failure like this will result in every fixture in the series losing power.

The Hunza LED shunt ensures that the rest of the fixtures stay working, making it simple to identify the failed LED, as well as keeping most of the lights on until the damaged one is fixed.

Hunza has revolutionised in-ground LED technology by developing the unique SafeTouch Gimbal system, as used in the SafeTouch 50, SafeTouch 100 and SafeTouch 150 product ranges.

The LED board is mounted on a spherical, aluminium “eyeball” gimbal that swivels inside a precision-machined heat-sink. Thereby maximising the surface area available for heat transfer, while providing 360 degree rotation and 0-20 degree elevation adjustment in any direction.

Heat is readily transferred from the LED module into the heavy duty fixture body, and from there into the surrounding installation medium. The heat is further reduced by means of air flow channels spaced around the perimeter of the outer collar. This is demonstrated in the diagrams below.

This allows the LED chip to operate at higher current levels – with a resulting increase in lumen output – while staying with the safe temperature limits specified by Cree. The unique swivel design of the eyeball allows the LED module to be aimed in any direction and then locking in place. This provides full 360 degree rotation and 0-20 degree elevation adjustment.

Hunza uses a single light source – Cree COB Module – in all the Safetouch Gimbal modules, to minimise the luminaire size and achieve a highly elegant and attractive appearance.

Hunza PureLED is a modular LED system designed to provide the ultimate combination of light output, illumination control and long-term performance from an outdoor-rated, sealed luminaire. It uses a single chip with high performance optics to provide a more pleasing aesthetic. There is a PureLED option for most luminaires in the Hunza product range.

Please see individual specification sheets for information on the LED options available.