Yeah, color temp isn’t just a feel‑good fluff – it actually shifts the whole energy of a scene. Start with a physically‑based light and tweak its RGB to match real‑world temps: warm (around 2700 K) gives that cozy, relaxed vibe, cool (6500 K) pushes a sharp, alert mood. In the shader you just offset the light’s spectrum, then feed that into your BRDF so the surface reflectance feels right. Don’t forget to clamp the luminance, otherwise you’ll burn out the highlights and the brain will scream. If you want to mimic circadian rhythm, ramp the temperature over time in the material – warm in the evening, cool in the morning – and use a low‑frequency noise to keep the transition natural. Keep your gamma close to 2.2; anything off and the subtle shift in hue will look like a glitch. Trust the HDR buffers, don’t cheat with approximations – that’s how you make light feel alive, not just look right.