Led Basics 1 PATRICK DAVIS, ORION ENERGY SYSTEMS

LED Fixture Parts Chip (die) Lens Board/Array Driver Heat Sink Fixture Body 2

LED Fixture Parts 3 LED DieSilicon Lens Metal Clad Printed Circuit Board Fixture Body/Heat Sink

LED Fixture Parts 4 LED Array (strip) Metal Clad Printed Circuit Board (Optional) Fixture Body/Heat Sink

LED Chip Phosphor- impregnated silicon Lens LED Chip LED Chip Photo of an ARRAY 5

LED Driver Not a ballast ◦Converts AC to DC ◦Converts voltage from VAC to 24 VDC ◦Different control methods ◦Constant current ◦Constant voltage 6

LEDs and Color

Batch Manufacturing Results in Color Temperature Differences 8

High Op Temperatures Result in Color Differences 9

Top 10 LED Vendors 10

CIE Color Chart 11 White light CIE = International Commission on Illumination

LED Binning 12

13 Cost of LEDs Efficacy (L/W)

LEDs and CRI CRI is not a good indication of LED color quality ◦Doesn’t account for saturated colors New Color Quality Standard (CQS) is being formulated 14

Trends Improvements in binning will result in tighter color temperature tolerances, smaller bins New standards for rating LED color rendering—Color Quality Scale (CQS) Organic LEDs (OLED) in SSL 15 LG OLED Desk Lamp

Questions? 16