Yeah, I’ve tackled that a few times. First make sure every source is in the same color space – HDR works best in linear, then convert to your display’s gamma once you’ve done the math. For specular highlights, use a physically based BRDF; that keeps the energy balanced no matter the lighting. Keep the same white point and exposure setting across scenes, or bake a lookup table that normalizes the luminance range before tone mapping. If you’re using a Reinhard or ACES filmic curve, just hit the same parameters each time – the curve is the same, so the highlights stay consistent. And if you notice a flash of banding, tweak the curve’s white clamp or add a small amount of noise to the specular bump to smooth it out. In short: linear math, same BRDF, consistent exposure, same curve, done.