Good morning! If your bulb isn't dimmable, you can use a diffuser. You can use materials like translucent plastic, parchment paper, white fabric, or panels specifically designed as light diffusers. Make sure the material is heat-resistant and poses no fire risk, but I doubt the bulb generates that much heat. You can attach it directly to the lamp using clips or adhesives if the design allows. You can also suspend it a few centimeters below the bulb using a frame or support, making sure the diffuser doesn't touch the bulb to avoid overheating. In the end, you can use an app like Photone to measure if you're happy with the result. Cheers!