Can I ask you in which way you purged the file? I used a Cleaner plug-in, but I'm pretty new, so it would be nice to know which function you used.

Thank you very much Sir, exactly what I wanted.
I will see if I can learn from some of your changes.

In the real room, the funtional light will probably come from the spotlights, but it's not quite sure yet.

Thank you very much.

Yes, sure. See link: https://www.dropbox.com/s/c758qs4tqa0rk5l/LED_Stripe_Modelskp.skp

I've both tried both with a emissive material and rectangle light, both with smaller and wider rectangle stripes.. Nothing seems to really give the wished effect with a gradient light going up the wall.
Afterwards I'm going to install IES-lights in all the spotlights, so the LED is to make a nice ambient light all around.

Thank you.

Hello all.

I'm trying to make a LED light stripe, but it won't enlighten the wall it's attached to, only light up the roof.

The stripe is actually just a list with a 1 cm LED-stripe in it.

See image for reference.

Thanks.
Andreas