How to Select Explosion-Proof Lights for High and Low Temperature Environments

1.Key Temperature Parameters

Common ambient ranges: -20°C to +40°C or -30°C to +55°C. High-end: -40°C to +55°C.
T-Class (max surface temperature):
T1 ≤450°C | T2 ≤300°C | T3 ≤200°C | T4 ≤135°C | T5 ≤100°C | T6 ≤85°C (strictest)

2.High-Temperature Challenges (>+40°C, especially >+55°C)

• A,Faster LED lumen depreciation and color shift
• B,Shorter driver life, power drop or shutdown
• C,Seal aging; aluminum expansion may affect flameproof joints

Countermeasures:

• A. Thermal-electric separation – separate light source and driver chambers with ventilation to avoid heat build-up.
• B. Reduce power – SEEKINGLED FL8 has DIP switches for 50%/75%/100% output. Most effective method.
• C. Use LiFePO4 batteries (better high-temp performance).
• D. Use silicone seals with good high/low-temp characteristics.

3.Low-Temperature Challenges (<-20°C, especially <-40°C)

• Difficult driver startup
• A,Brittle plastics/seals affecting protection
• B,Sharp drop in emergency battery capacity
• C,Condensation or icing risk

Countermeasures:

• A. Wide-temp drivers (start to -40°C)
• B. Add heating modules
• C. Use Ni-Cd batteries (better low-temp performance)
• D. Use silicone seals with good high/low-temp characteristics

4.Selection Tips

• A,Confirm max/min site temperatures and leave >10°C margin
• B,Check both T-Class and ambient temperature (Ta)
• C,Prefer wide-temp products (-40°C to +55°C or wider)
• D,Verify ranges in IECEx/ATEX reports

Summary
SEEKINGLED lights are tested and certified for -40°C to 55°C. 90% of models are T6 and can be selected with confidence.