For the colour, unless you are aiming for that palette trying using lights which are far more 'white' (e.g. only a tiny bit of yellow), you can also use very light blue-white for 'artificial lighting' (e.g. fluorescent) and/or skylights/windows can also let you use the environment lighting from the skybox for other colour mixes. If you aren't set on that much realism you can also use texture lights.
I'd also suggest looking at other light entities. In particular as you seem to be using props for globes/lamps etc have a play around with the light_spot entity, can be handy to disperse light towards what needs to be lit without just putting smudges over walls and can provide more controlled lighting. They also need much higher brightness numbers compared to generic light entities in my experience.
You can also adjust the generic light entities for their maximum distance, falloff rate etc. which can allow for more even lighting without resorting to just ramping up the brightness number.
Some good links if you are interested in reading about more lighting techniques.
https://steamcommunity.com/sharedfiles/filedetails/?id=158909187http://www.interlopers.net/tutorials/17779