Light in box [Resolved]

Hello everyone !

I need you help i seek this tutorial :

But in my unreal engine 4.15 the light he doesn’t work …

In left my Box and right box of tutorial :

My code :

i try and retry to seek this tutorial but i don’t understand why we don’t work with me

Thanks …

Try increasing the multiply of your emissive, that last multiply from 30 to 75 or 100 and work your way down or up to adjust it to match your desired effect.

I doesn’t not change just more white …

Nobody can help me ?

Ok i resolve my problem go to Project settings > Engine - Rendering > Mobile HDR
Disable Mobile HDR and restart you computer and done !
I don’t understand what is the purpose of this HUB if no one can help us?