Does upgrading LED stadium lights require a complete redesign of the lighting scheme?

Absolutely. LEDs and metal halide lamps have completely different optical characteristics and cannot be simply replaced "one-to-one" (one LED for one metal halide lamp). The reasons are as follows:

First, the light distribution curves are different. Metal halide lamps typically emit light in 360 degrees, relying on reflectors for light distribution; LEDs emit light directionally, forming a specific light distribution through lenses. Replacing them in the same location may result in changes in the shape and coverage of the light spot, creating dark areas or excessive illumination.

Second, the color temperature and color rendering index are different, requiring a reassessment of the impact on the field's visual perception.

Third, the luminous flux and power ratio are different. LEDs have only about half the power of metal halide lamps, but their luminous flux may be higher or lower, requiring recalculation in lumens.

Fourth, the installation location and angle need optimization. Utilizing the narrow beam advantage of LEDs may reduce the number of lamps or change the position of the light poles.

Fifth, the control system needs to be redesigned to fully utilize the LED's dimming and scene switching capabilities.

Sixth, heat dissipation and electrical loads need to be recalculated because LED drivers have higher requirements for power quality. Therefore, before upgrading to LED lighting, a complete site survey and software simulation (DIALux or AGi32) must be conducted by a lighting designer to generate a new lighting layout and aiming scheme.

A professional lighting design plan typically includes: illuminance simulation diagrams, luminaire selection tables, aiming angle tables, control system diagrams, and budget sheets. Even for small venues, it is recommended to conduct at least a simple simulation to avoid unnecessary detours.