How to Conduct Environmental Testing for LED Therapy Devices

We shipped LED masks to a customer in Saudi Arabia. The masks arrived with cracked enclosures. The temperature during shipping exceeded 50°C. We hadn’t tested for high-temperature exposure. After that, we implemented environmental testing. Here’s what to test.

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The Environmental Tests

Test	Description	Standard	Conditions
High temperature	Test at elevated temperature	IEC 60068-2-2	+55°C for 48 hours
Low temperature	Test at low temperature	IEC 60068-2-1	-10°C for 48 hours
Temperature cycling	Cycle between high and low temperature	IEC 60068-2-14	-10°C to +55°C, 10 cycles
Humidity	Test at high humidity	IEC 60068-2-78	93% RH at +40°C for 48 hours
Vibration	Simulate transportation vibration	IEC 60068-2-6	10-500Hz, 30 minutes per axis
Drop test	Drop from various heights	IEC 60068-2-31	1 meter onto concrete
IP rating (water/dust resistance)	Test for ingress protection	IEC 60529	IP20 (no protection) to IP68 (waterproof)

The high temperature test is essential for shipping and storage. Products may be exposed to high temperatures in shipping containers, warehouses, or hot climates. Test at +55°C or higher.

The humidity test is important for LED therapy devices. High humidity can cause condensation, which affects electronics. Test at 93% RH to simulate worst-case conditions.

The Testing Process

Step	Action
1. Define test plan	Which tests to conduct, test conditions, pass criteria
2. Prepare samples	3-5 units for testing
3. Conduct tests	In-house or send to test lab
4. Evaluate results	Did the product pass? Were there failures?
5. Document	Test report with photos, data, conclusions
6. Redesign if needed	If failures occurred, redesign and retest

The test lab cost is $2,000-5,000 for a full environmental test suite. In-house testing requires environmental chambers ($5,000-20,000 equipment cost). For small companies, using a test lab is more cost-effective.

What We’ve Learned

1. The Saudi Arabia shipment failure cost us $5,000 in replacements. We hadn’t tested for high temperature. Now we test at +55°C for all products.

2. The humidity test caught a condensation issue. Our LED driver had condensation on the PCB at 93% RH. We added conformal coating to protect the PCB. The redesign cost $0.50/unit but prevented failures.

3. The vibration test simulates shipping. We simulate truck transportation (vibration for 30 minutes per axis). This caught a loose connector issue. We added a strain relief to the cable.

Environmental testing for LED therapy devices requires high/low temperature testing, temperature cycling, humidity testing, vibration testing, and drop testing. Test at realistic worst-case conditions to prevent field failures.