Great lights but after trying several dimmer switches I'm struggling to find one that will dim these lights. Yes, my dimmers are rated for LEDs and I've tried LED dimmers up to 300W, but I think the problem is that the minimum load for the dimmer isn't being met. I will update my review if I can understand the shading part. I have updated my rating to 5 stars because my ignorance was giving me problems with these lights. I looked at the instructions and bought the dimmer listed in the instructions and now the light works perfectly. I connected 16 of these and they look amazing!