Grandlite LED Technology NSi Presentation

LED Luminaire

Technology Basics

NSi Sales and Technical Training

August 18/19, 2014

The average efficacy of new LED luminaires has increased from 40 to 85 lumens per watt over the last five years.

LED efficacy can go much higher. Grandlite LED luminaires are pushing past 120 lumens per watt – with retrofits alone.

ARL-816LED area luminaire

15,000 lumens125 watts120 lumens per watt

Cree XLamp XT-ESingle-die LED package

Highest flux bin package produces 148 lumens at 350mA and 85 degrees celsius

0.35 amps x 2.85 forward volts = 1 watt

So 148 lumens per watt

Grandlite uses flux bin R3, which produces 122 lumens at the same drive current and temperature, for 122 lpw.

LED lumens Luminaire optical efficiency

Drive current

Temperature

Luminaire lumens

Luminaire input wattage

Luminaire efficacy

LED wattage

Driver efficiency

Input voltage

Luminaire thermal

dissipation

Driver model

LED model

LED luminaire design summary

LED packages are designed to be mounted on a printed circuit board. These PCBs are generally designed to fit a

particular luminaire application.

Cree XT-E LEDs mounted to a PCB

Metal core PCBs (MCPCBc) are typically used for mounting high-power LEDs. The alumimum base acts as

a heat spreader and thermal path to the heatsink.

Grandlite designs and manufactures its own MCPCBs to spec for its LED luminaires.

Methods of current control

Current control circuit(“IC”) included on

MCPCB with the LEDs. Constant voltage

supplied by the LED driver.

IC can also be on a separate PCB

Methods of current control

Or, a constant current driver can be used with an LED board. This works best when the LEDs are arranged in

series, not in parallel.

Integrated LED array

An MCPCB with many individual LED packages can be replaced by a single integrated LED array (“Chip on Board”).

C.O.B.s are typically used with constant-current drivers.

=

Cree CXA3590 C.O.B. LED array168 individual LED dies, >10,000 lumens

The LEDs in Grandlite luminaires operate on low-voltage direct current (DC), and therefore require LED drivers that

convert alternating current (AC) wall voltage into a useable DC voltage.

Class 2 driver: less than 60 volts DC output and less than 100 watts. According to UL, no “risk of

electric shock” – no enclosure required.

Class 1 driver: greater than 60 volts DC output or greater than 100 watts. According to UL, “risk of

electric shock” – enclosure required.

VA = 240