Since the light engine connects to the main power supply, it must carry relevant certifications. For the US market, look for UL or ETL listing; for the European market, CE and RoHS certifications are mandatory. Ensure the power adapter supports universal voltage (110V-240V) to avoid compatibility issues. Because the fibers themselves do not carry electricity or heat, they are inherently safe for damp environments like bathrooms or spas, but the light engine must be kept in a dry, ventilated area.