LED Lighting

LED Lighting - White

Part Number	Description / PDF	Quantity
SMLW36WBFAW1 ROHM Semiconductor	LED SMLV36 COOL WHT 5000K 6SOIC	1831
PSL0101WBFD1 ROHM Semiconductor	LED PSL0101 WARM WHT 3000K 2SMD	1893
PSL0101WBFB1 ROHM Semiconductor	LED PSL0101 WARM WHT 3000K 2SMD	1844
SMLW36WBFBW1 ROHM Semiconductor	LED SMLV36 WARM WHT 3000K 6SOIC	1933
SMLW36WBFCW1 ROHM Semiconductor	LED SMLV36 COOL WHT 8000K 6SOIC	1604
SMLV36WBFDW1 ROHM Semiconductor	LED SMLV36 COOL WHITE 5000K 1411	0
SMLV36WBFBW1 ROHM Semiconductor	LED SMLV36 WARM WHITE 3000K 1411	978
SMLV36WBFAW1 ROHM Semiconductor	LED SMLV36 COOL WHITE 5000K 1411	1876
SMLK18WBJDW1 ROHM Semiconductor	LED SML COOL WHITE 5000K 4SMD	0
SMLK18WBJBW1 ROHM Semiconductor	LED SML WARM WHITE 3000K 4SMD	218
PSL0102WBEA1 ROHM Semiconductor	LED PSL0102 COOL WHT 5000K 2SMD	1050
SMLK28WBJCW1 ROHM Semiconductor	LED SML COOL WHITE 8000K 4SMD	347
PSL0102WBFC1 ROHM Semiconductor	LED PSL0102 WARM WHT 3000K 2SMD	1816
PSL0101WBFC1 ROHM Semiconductor	LED PSL0101 WARM WHT 3000K 2SMD	1604
SMLK18WBJCW ROHM Semiconductor	LED SML COOL WHITE 8000K 4SMD	601
SMLV36WBFCW1 ROHM Semiconductor	LED SMLV36 COOL WHITE 8000K 1411	413
PSL0101WBFA1 ROHM Semiconductor	LED PSL0101 WARM WHT 3000K 2SMD	0
PSL0101WBED11D2 ROHM Semiconductor	LED PSL0101 COOL WHT 5000K 2SMD	0
PSL0102WBFB1 ROHM Semiconductor	LED PSL0102 WARM WHT 3000K 2SMD	0
PSL0101WBEB1 ROHM Semiconductor	LED PSL0101 COOL WHT 5000K 2SMD	0

LED Lighting - White

1. Overview

White Light-Emitting Diodes (LEDs) are semiconductor devices that convert electrical energy into visible white light. They represent a fundamental shift from traditional lighting technologies due to their energy efficiency, longevity, and controllability. Modern white LEDs primarily use blue-emitting chips coated with phosphor materials to produce broad-spectrum white light, enabling precise color tuning and dimming capabilities.

2. Major Types & Functional Classification

Type	Functional Features	Application Examples
Blue Chip + Yellow Phosphor	Cost-effective, CRI 70-90, correlated color temperature (CCT) 2700-6500K	General lighting, residential bulbs
RGB Tri-color	Tunable color output, high CRI (>90), complex driver requirements	Stage lighting, architectural accenting
UV Chip + RGB Phosphor	Enhanced color rendering, reduced blue light hazard	Museum lighting, medical diagnostics
Remote Phosphor	Uniform light distribution, improved thermal management	Commercial downlights, automotive headlamps

3. Structure & Components

Typical white LED construction includes:

Die: Gallium Nitride (GaN) on sapphire substrate emitting blue light (450nm)
Phosphor Layer: Cerium-doped YAG (Y₃Al₅O₁₂) converting blue to yellow wavelengths
Encapsulation: Silicon dioxide lens with secondary optical elements
Thermal Interface: Metal-core PCB (MCPCB) for heat dissipation
Driver Circuit: Constant current source with EMI filtering

4. Key Technical Parameters

Parameter	Typical Range	Importance
Luminous Flux	100-20,000 lm	Determines light output capability
Color Temperature	2700K-6500K	Affects ambiance and visual comfort
Color Rendering Index (CRI)	70-98	Measures color fidelity accuracy
Luminous Efficacy	100-200 lm/W	Energy conversion efficiency metric
Lifespan	25,000-100,000 hrs	Total cost of ownership factor
Forward Voltage	2.8-3.6 V	Driver design specification

5. Application Fields

Residential: Smart bulbs, under-cabinet lighting
Commercial: Retail accent lighting, office panel lights
Industrial: High-bay warehouse fixtures, machine vision systems
Transportation: Automotive headlights, aircraft cabin lighting
Healthcare: Surgical lighting, circadian rhythm regulation

6. Leading Manufacturers & Products

Manufacturer	Key Product Series	Technical Highlights
Signify (Philips)	Luxeon 3535L	180 lm/W efficacy, 90 CRI, automotive grade
OSRAM Opto	Ostar Lighting	Surface-mount package, 2000cd/m luminance
Cree (Wolfspeed)	XHP50.2	High-density emitter, 20A drive current capability
Seoul Semiconductor	WICOP2	Chip-level integration, 0.2W-100W scalability

7. Selection Recommendations

Key considerations:

Optical requirements: Match CRI and CCT to application needs
Thermal management: Select appropriate heatsink and package type
Electrical compatibility: Verify driver specifications and dimming protocols
Form factor: Consider footprint constraints (e.g., 2835, 5630 packages)
Regulatory compliance: Ensure ENERGY STAR, DLC, or UL certification

8. Industry Trends

Emerging developments include:

Micro-LED integration for displays and Li-Fi communication
Quantum dot phosphors expanding color gamut (NTSC >100%)
Smart lighting systems with IoT connectivity (Zigbee, Bluetooth Mesh)
Advanced thermal materials (graphene MCPCBs)
Regulatory shifts toward higher minimum efficacy standards (DOE 2023: 120 lm/W)