Cycles: Emission Shader does not bring enough light Since two or three month I'm building a Titanic Model in Blender 2.74.
I'm using Cycles Renderer and a GTX750TI for rendering.

On A-Promenade I built the Windows with a Diffuse-Material for Frame, a Glas-Material for (guess what!) the Glas and an Emission-Material on the Backside of the Window. This works pretty well and makes a nice light on this Deck. 



But I also need some white light from Lamps so I built these Lamps in a Diffuse- (For Frame) and an Emission-Shader (For "illuminated" Glass) but I get no light from the Emission of the Lamp-Material. 



When I turn off the Emission from Windows the whole Deck is black (except the Faces themselve). Even if I set the Strength from Lamp Emission to 100000 or more there would be no light. 

I don't want to add a Point-Lamp for every Lamp I built so what else can I do? 

Here's the simplified .blend File:

https://www.dropbox.com/s/nyb7i004kgdt77r/Titanic%20%282%29.blend?dl=0
The reason your scene is so dark and don't see any light, is because you are clamping all of the Direct and Indirect light to 0.5:



What that means is that NO LIGHT WILL BE BRIGHTER THAN 0.5 (0 being black, 1 being White).
Even if you make the lights extremely bright they will never be white!

You where probably trying to cut out fireflies, but by bringing the values so low you are clipping all of your highlights too!



With more reasonable Clamp Values you can regain control of your lights. Now the emitters on your lamps can be brought down: