Technical Guide · 8 min read
COB vs SMD LED: Which Should You Choose for Professional Lighting?
When specifying LED light sources for film, broadcast, stage, or architectural fixtures, the choice between Chip-on-Board (COB) and Surface-Mounted Device (SMD) packaging directly shapes beam quality, thermal performance, and manufacturing cost. This guide breaks down the trade-offs.
What Is COB?
COB packages multiple LED chips directly onto a single substrate, sharing a compact Light-Emitting Surface (LES). With no individual package headers, COB delivers a uniform, glare-free point source ideal for optics with tight beam control.
What Is SMD?
SMD LEDs are individual packaged diodes soldered onto a PCB. Available in standardized footprints (e.g., SMD2016, SMD5050, SMD7070), they offer design flexibility, easy assembly, and cost efficiency at scale.
Key Differences
- Beam quality: COB produces a single clean source with minimal pixelation; SMD arrays can show discrete points unless diffused.
- Thermals: COB's direct substrate bonding spreads heat better, enabling higher current density.
- Color mixing: For RGBW/RGBLAC, COB keeps channels close for smoother blends; SMD needs careful optical mixing.
- Cost: SMD is generally cheaper and faster to assemble; COB commands a premium for optical quality.
When to Choose Which
Choose COB for high-end spotlights, film panels, and studio fixtures where beam uniformity is critical. Choose SMD for ambient, architectural, signage, and high-volume cost-sensitive products. Many fixture makers use both — COB for the key light, SMD for fill or accent.
Explore COB LED Modules → Buying Guide · 6 min read
How to Choose LED Modules for Stage & Broadcast Lighting
Stage and broadcast environments demand color accuracy that holds up on camera. Here's what B2B buyers should evaluate before sourcing LED modules.
1. Color Rendering: CRI, TLCI, and SSI
For on-camera work, TLCI > 95 and SSI > 90 matter more than CRI alone. RGBLAC 6-channel architectures extend gamut ~1.4× over RGBW and meet Netflix/EBU broadcast standards.
2. CCT Range & Tuning
Broadcast studios need smooth 1800K–10000K tunability. Look for dedicated warm-white and cool-white channels plus tint (G/M) adjustment to match ambient sources.
3. Thermal & Reliability
High-power fixtures run hot. Specify copper-substrate COB with thermal-electric isolation, and verify binning consistency across batches for uniform fixtures.
4. Dimming & Control
Ensure flicker-free PWM dimming and DMX/RDM compatibility. For RGBLAC, confirm the console can address 6+ channels per fixture.
Explore LED Engines → Color Science · 7 min read
Understanding RGBLAC: The 6-Channel Spectral LED Architecture
RGBLAC extends the traditional RGB triplet with Lime, Amber, and Cyan channels — a spectral engineering approach that solves the metamerism problems plaguing 4-channel RGBW systems.
Why Add Lime, Amber, and Cyan?
Red, Green, and Blue alone leave gaps in the spectrum where cameras and eyes disagree. Adding Lime (555–570nm) lifts green efficiency, Amber (590–600nm) fills the warm gap for accurate skin tones, and Cyan (490–505nm) improves aqua/cyan reproduction and raises TLCI.
Measurable Gains
- Color gamut ~1.4× wider than RGBW
- CRI > 95 and TLCI > 95 across 1800K–20000K
- SSI > 90 — spectral match to reference sources
- Per-channel calibration eliminates metameric failure on ARRI, RED, and Sony Venice sensors
Where It Wins
RGBLAC is purpose-built for cinema, live broadcast, and virtual production where color fidelity is non-negotiable. The trade-off is higher BOM cost and control complexity — worth it when the brief demands broadcast-grade color.
Explore RGBLAC Technology → 