Pure LED – Series Wiring

Remote Constant Current Driver – series wired version

A constant current remote driver system is the most efficient and cost effective way of powering HUNZA PURE LED fixtures, however the installation requirements are a little different from traditional methods.

When using a remote constant current driver, it is very important to note that the fixtures need to be wired in series instead of the more traditional parallel wiring systems. This LED Wiring System Diagram shows the difference between these two wiring systems. 

These Remote Driver Selection Charts show the range of Hunza constant current remote drivers. 

USA HUNZA REMOTE DRIVER SELECTION CHART

DRIVER BRAND	DRIVER MODEL	OUTPUT CURRENT	OUTPUT VOLTAGE RANGE DC	AC INPUT VOLTAGE	DIMMING	UL	QUANTITY OF FIXTURES HUNZA PURE LED XPG	QUANTITY OF FIXTURES HUNZA PURE LED XHP*
NON DIMMING:
LIGHTECH	LED-6DC-350	350 MA	2-20V	120-277V	NO	YES	1-6	1-2
EPTRONICS	LD12W-36-C0350	350 MA	18-36V	100-277V	NO	YES	6-11	3-5
SUITABLE FOR TRIAC DIMMERS:
EPTRONICS	LD25W-72-C0350-LE	350 MA	36-72V	90-305V	TRIAC	YES	12-23	6-11
EPTRONICS	LD20W-28-C0700-LE	700 MA	14-28V	100-277V	TRIAC	YES	5-9	3-4
EPTRONICS	LD25W-36-C0700-LE	700 MA	12-36V	90-305V	TRIAC	YES	4-11	2-5
EPTRONICS	LD25W-24-C1040-LE	1040 MA	8-24V	90-305V	TRIAC	YES	–	2-3
SUITABLE FOR ELV (ELECTRONIC LOW VOLTAGE) DIMMERS:
EPTRONICS	LD25W-72-C0350-TE	350 MA	36-72V	90-305V	ELV	YES	12-23	6-11
LIGHTECH	LED-18DC-700	700 MA	4-26V	120-277V	ELV	YES	2-8	1-3
EPTRONICS	LD20W-28-C0700-TE	700 MA	14-28V	100-277V	ELV	YES	5-8	3-4
EPTRONICS	LD25W-36-C0700-TE	700 MA	12-36V	90- 305V	ELV	YES	4-11	2-5
EPTRONICS	LD25W-24-C1040-TE	1040 MA	8-24V	90-305V	ELV	YES	2-3	2-3
SUITABLE FOR 0-10V DIMMERS/CONTROLLERS:
EPTRONICS	LD25W-72-C0350	350 MA	36-72V	90-305V	0-10V	YES	12-23	6-11
EPTRONICS	LD20W-28-C0700	700 MA	14-28V	100-277V	0-10V	YES	5-8	3-4
EPTRONICS	LD25W-36-C0700	700 MA	12-36V	90-305V	0-10V	YES	4-11	2-5
EPTRONICS	LD25W-24-C1040	1040 MA	8-24V	90-305V	0-10V	YES	2-3	2-3
HUNZA	TCI-122413	350 MA	0-74V	99-264V	0-10V	YES	1-23	1-11
HUNZA	TCI-122413	700 MA	0-57V	99-264V	0-10V	YES	1-18	1-8
HUNZA	TCI-122413	1050 MA	0-38V	99-264V	0-10V	YES	1-11	1-5
SUITABLE FOR DALI DIMMERS/CONTROLLERS:
HUNZA	TCI-122413	350 MA	0-74V	99-264V	DALI, 0-10	YES	1-23	1-11
HUNZA	TCI-122413	700 MA	0-57V	99-264V	DALI, 0-10	YES	1-18	1-8
HUNZA	TCI-122413	1050 MA	0-38V	99-264V	DALI, 0-10	YES	1-11	1-5
DIPSWITCH DIMMING (CONTROL ON DRIVER):
TCI	MP15	60-360	0-41V	100-240V	DIPSWITCH	YES	1-12	1-5
PC-17-02	PolyCase Enclosure W/Mounting Kit and Standoff*	YES

* Polycase enclosure is required for UL approval

HUNZA REMOTE DRIVER SELECTION CHART – AUSTRALASIA AND EUROPE

DRIVER BRAND	DRIVER MODEL	OUTPUT CURRENT	OUTPUT VOLTAGE RANGE DC	AC INPUT VOLTAGE	DIMMING	C-TICK	QUANTITY OF FIXTURES PURE LED XPG*	QUANTITY OF FIXTURES PURE LED XHP*
SUITABLE FOR 0-10V & DALI DIMMERS/CONTROLLERS:
HUNZA	LCM60	500MA	2-90V	180-295V	NO	YES	1-28	1-13
HUNZA	LCM60	700MA	2-86V	180-295V	NO	YES	1-27	1-13
HUNZA	LCM60	1050MA	2-57V	180-295V	NO	YES	1-16	1-8
HUNZA	LCM60/EN*	500MA	2-90V	180-295V	NO	YES	1-28	1-13
HUNZA	LCM60/EN*	700MA	2-86V	180-295V	NO	YES	1-27	1-13
HUNZA	LCM60/EN*	1050MA	2-57V	180-295V	NO	YES	1-16	1-8
DIPSWITCH DIMMING (CONTROL ON DRIVER):
TCI	MP15	60-360MA	0-41V	100-240V	DIPSWITCH	YES	1-12	1-5

*WATERPROOF ENCLOSURE VERSIONS – THESE ARE RECOMMENDED FOR MOST OUTDOOR INSTALLATIONS

Please also see our HUNZA PURE LED Specification Chart for information on LED types and lumen output for the range of Hunza fixtures. 

When it comes to selecting the correct driver for your series circuit we advise not to focus on the wattage of the LEDs but on the forward voltage of the LED used in the fixture. This a constant current system therefore the current does not change, instead the forward voltage increases as LEDs are added to the circuit. You MUST NOT use a driver that has a minimum output voltage higher than the LED total voltage load.  For example, if the driver voltage range is 8 – 26 volts forward (Uout=8-26vdc) and the total LED voltage load is only 6vF then the driver will overload the LED. 

In most situations, it is highly recommended that remote driver should be installed inside a waterproof enclosure. This helps to protect the driver and connections against the weather and provides extra safety.

Dimming:

All Hunza Series version fixtures are dimmable however it is important that the correct combination of dimmer and remote driver is used. The Remote Driver Selection Chart  show the correct type of dimmer required for the selected driver. Please check the specification sheets for each driver as there may be some different options available and it may also pay to check with the supplier of the dimmer to see if there are any compatibility issues.

The best dimming performance will be achieved with 0-10v or Dali dimming/control systems, however these require an extra set of wires to be connected between the driver and control system.

Some smart control systems require a bridging component to suit the type of driver dimming type. These are available from the control system supplier. 

Triac and ELV drivers may only allow dimming down to about 30% of full brightness.

Voltage Drop Calculations:

Please see the following examples that demonstrate some typical driver calculation situations, and you may also like to consult our HUNZA PURE LED Remote Driver Voltage Drop Chart for specific information on distances and cable sizes.

Example 1:

A customer has 4 x HUNZA SS/L (Spike Spot PURE LED). These fixtures use Cree XPG LEDs, which have a 6vF (volts forward) requirement. MTG LEDs can be driven at 350, 700 or 1000mA. In this example the customer wants to drive the fixtures at 700mA and he has four fixtures in the circuit. 

We recommend our TCI122413 model from the table above rated at 700mA with a forward voltage range of 0 – 57 volts (Uout=0-57vdc), and we calculate the driver specification as follows:

As the driver is constant current at 700mA all that needs to be calculated is the forward voltage required i.e.: 4 x SS/L fixtures at 6vF = 24vF. This falls well within the TCI122413 driver range of 0-57 forward volts.

The calculation to check the maximum number of fixtures allowable is as follows:

57v (maximum driver voltage output) divided by 6 (LED forward voltage) = 8 fixtures maximum with 9 volts spare for cable voltage drop. For additional protection against the likelihood of cable voltage drop, we could limit the maximum to 7 fixtures and this will give 15 volts spare.

Example 2. 

A customer has 8 x HUNZA BL/L (Border Lite PURE LED). These fixtures use Cree XPG LEDs which have a 3vF (volts forward) requirement. XTE LEDs can be driven at 350 or 700mA. For this example the customer wants to drive the fixtures at 350mA and he has six fixtures in the circuit. 

We recommend our TCI122413 model from the table above rated at 350mA with a forward voltage range of 0 – 74 volts (Uout=0-74vdc), and we calculate the driver specification as follows:

As the driver is constant current at 350mA all that needs to be calculated is the forward voltage required, i.e.: 8 x BL/L fixtures at 3vF = 24vF. Again, this falls well within the TCI122413 driver range of 0-74 forward volts.

The calculation to check the maximum number of fixtures allowable is as follows:

74v (maximum driver voltage output) divided by 3 (LED forward voltage) = 23 fixtures maximum with 5 volts spare for cable voltage drop. For additional protection against the likelihood of cable voltage drop, we could limit the maximum to 22 fixtures and this will give 8 volts spare.