I want make emissive hidden celling light, like led lighting, but I don't have idea how to make it.

52985-hidden_celling+light.jpg

Try making a material and then applying it to a BSP or mesh

Thanks, I tried that, but not good enough because there is not enough emissive light. I want light this area with very soft light.

Increase the emissive multiplier and then enabe Use Emissive for Static Lighting in that mesh’s details, then rebuild the lights.

Wao! Thanks a lot, this is working!