The thermal management of the LEDs. If LEDs come on a standalone chip, appropriate heat sinks have to be designed to prevent premature failure of LEDs.
The electrical stress: Running LEDs at currents higher than specified make the LED run hot. This can happen with wrongly matched drivers. For example, if the driver produces 700mA but the LED needs 350mA, this will put stress on LED and reduce its lifespan.
Higher ambient temperatures than the ones that the LED is rated for will reduce its expected life.
The efficiency of LEDs as a function of the color temperature
The choice of color temperature has a major influence on luminous efficacy and can be used within the framework of existing lighting regulations as a lever for the efficient planning of led stadium lights solutions. LEDs with a high correlated color temperature (CCT) (e.g., 5000K) generally have a higher efficiency than those with a relatively low CCT (e.g., 3000K). The curves on the graph in Fig.
Show the spectrums (or spectral power distributions – SPDs) of typical LEDs at different CCT values for general illumination with a color rendering index (CRI) of Ra >80. The SPD curves are overlaid on the human sensitivity curve Vλ (V lambda).