How to Choose a High-Power COB LED Module: 6-Step Guide

Specifying a high-power COB LED module is a system-engineering decision: output, color, thermals, optics and drive electronics must close together. This guide walks through the selection process TYANSHINE engineers use with fixture manufacturers.

Step 1: Define the Optical Budget First

Work backward from the fixture requirement:

1. Target illuminance at distance d → required luminous intensity
2. Beam angle → reflector/lens gain
3. Required luminous flux = intensity ÷ (optical efficiency × gain)
4. Add 20–30% margin for lumen depreciation over lifetime (L70/L80 targets)

The flux number — not wattage — drives the module choice. Efficacy varies strongly with CRI: a CRI 95 module delivers fewer lumens per watt than a CRI 80 module at the same power.

Step 2: Match the LES to Your Optic

The Light Emitting Surface diameter must suit the reflector:

• Small LES (9–15mm): tight beam control, profile spots, high-intensity searchlights
• Medium LES (15–25mm): Fresnels, generic wash optics
• Large LES (25mm+): soft, even beams for flood and panel fixtures

A mismatch here is the #1 cause of optical efficiency loss in COB fixtures.

Step 3: Set the Color Requirements Honestly

Every CRI point costs flux — specify what the application actually needs.

Step 4: Engineer the Thermal Path Before Choosing Power

High-power COB reliability is a thermal problem. Check:

• R_th j-b (junction to board): ceramic substrates and eutectic bonding minimize it — see our COB thermal management guide
• Tc (case temperature) rating: the Tc at which the datasheet's flux and lifetime numbers are valid
• Heatsink budget: module selection and heatsink design must be co-optimized, not sequential

Step 5: Choose the Drive Architecture

• Constant current: maximum control precision for professional engines
• Constant voltage: simpler integration for long runs and distributed drivers — see CV tunable white COB
• Multi-channel: TW needs 2 channels, RGBW 4, RGBLAC 6 — driver channel count scales accordingly

Step 6: Validate with Real Data

1. Request integrating sphere reports per bin, not just typical values
2. Run thermal imaging at your real Tc, not lab conditions
3. Check chromaticity over drive range — some modules shift green at low dimming
4. Sample across the whole family (e.g. 7W–700W platforms share mechanics) to simplify future fixture variants

Browse the TYANSHINE high-power COB LED module lineup or send us your optical and thermal targets — our engineers will propose the closest platform or a custom design.