checking the side dimentions of my scene.

http://www.digitaltutors.com/tutorial/523-Rendering-Interiors-with-mental-ray-and-Maya#play-376

https://forums.creativecow.net/thread/61/859277

this helped my realise that i need to keep the sizes accurate, so that lighting would be more realistic.

The forum showed me how to customise what mesurments i want to be using while the video from digital tutors allowed me to realise the importance of proper scaling.

in this image it shows that i have used the distance locator to check the size of my scene.