Ballast heat dissipation methods

1. Natural air cooling (passive cooling, most common for low power LPHO)The ballast uses aluminum shell with fin heat sink, heat dissipated by natural air convection, no fan.

• Advantages: Simple structure, no noise, low failure rate, maintenance-free, IP65 available

• Disadvantages: Limited heat dissipation capacity, not suitable for high-power medium-pressure ballasts; overheating risk in sealed cabinets

• Application: Low power LPHO ballasts, control cabinet with good ventilation

2. Forced air cooling (active air cooling, medium & high power centralized cabinet)Axial fans installed in control cabinet to boost airflow for multiple ballasts.

• Advantages: Strong cooling capacity, reasonable cost; preferred for multi-ballast control cabinet

• Disadvantages: Fan is wearing part, noise; dust and moisture may block filter and damage fan

• Application: Medium pressure UV systems, electrical cabinets with multiple lamps

3. Water cooling (liquid cooling, high-end high power, in-line / open channel UV)IP68 fully potted sealed ballast submerged in process water for heat exchange; cold plate water cooling is alternative.

• Advantages: Excellent cooling, low temperature rise, greatly extend ballast life; stable under high ambient temperature

• Disadvantages: High cost, strict sealing requirement; leakage risk leads to equipment burnout

• Application: High power medium pressure UV modules, high water temperature working condition, limited installation space

4. Potting thermal conduction (internal thermal enhancement, combined with above cooling methods)Thermal epoxy filled inside ballast to transfer heat from power components to metal housing. Not a standalone cooling method.

• Advantages: Improve thermal conductivity, moisture-proof, anti-condensation, shock resistance; standard for submersible ballast

• Disadvantages: Non-repairable after potting; whole unit replacement required when failed

Selection tips: Standard LPHO projects → aluminum shell natural air cooling; multi-lamp cabinet → forced air cooling; high-power MP / high inlet water temperature → water cooling.