I need help with a step by step guide to how to solve the following attached problem related to comparison between a Lambertian and non-Lambertian

I need help with a step by step guide to how to solve the following attached problem related to comparison between a Lambertian and non-Lambertian source. Given their radiance and assuming the two sources have the same area, the question asks the relationship the two sources must have to emit the same amount of total power(please see attachment):.