Image is too dark once rendered

[destinyw24598570]

Hello everyone. I am TOTALLY new to photoshop. I'm trying to make a realistic marquee letter. So i go into 3D and change all my settings and it looks great. Then i try to render it and it goes like 2-3 shades darker. I have no idea why. I read online that it could be something to do with my color settings, but i know NOTHING about that. Can someone help explain to me what I need to do? Thanks!

[Glenn 8675309]

Have you been adjusting the angle / intensity of the light source?   It can make a world of difference. 

[davescm]

Without seeing your lighting and material settings we are left guessing, but you could try clicking on Scene in the 3D panel then check Linearise colours in the Properties Panel

Dave