Radiance transfer computation from unknown real-world environments is an intrinsic task in probe-less photometric registration for photorealistic augmented reality, which affects both the accuracy of the real-world light estimation and the quality of the rendering. We discuss acceleration methods that can reduce the overall ray-tracing costs for computing the radiance transfer for photometric registration in order to free up resources for more advanced augmented reality lighting. We also present evaluation metrics for a systematic evaluation.