Ta grades are LED lamp specifications that few people know but are vital. Ta or "ambient temperature" is the reference temperature of the ambient air when the test ac dc power supply reaches rated performance.

This specification is important in critical or demanding environments. For example, the default test temperature in the lab may be only 25 ° C without specific instructions from the manufacturer.

If the luminaire is to be installed in a harsh environment with an average temperature of 50 ° C, the 25 ° temperature difference will have a large negative impact on the life expectancy of the product.

In addition, another key reference is Tc, which is the hottest point of the luminaire assembly when tested at the selected ambient temperature.

In the above theoretical case, the Tc point on the driver power supply can be tested at Ta at 50 °C and 25 °C.

If the Ta of the actual installation environment is 50°, it can be considered that the Tc may rise above the reliable working limit of the device.

All in all, Ta is an important technical specification and should be carefully studied to ensure that the selected led power supply is suitable for the intended installation environment.