Hi Robo2010

Domestic lighting was totally different back in the 50's and 60's to what it is now. It was mainly incandescent 25W to 60W with occasional 3000K or 4000K fluorescent mainly in kitchen areas. Most lamps where either 25 or 40 while ceiling lights where 60. Although this is not exact as wattage doesn't relate directly to colour etc but a 60W incan bulb is roughly 2750K and a 40W around 2500K . I notice your light colour looks really white. White light doesn't start till about 5000K and was unheard of in reality in domestic homes back then. A 60W is a yellowy orange colour. You would never notice that they are not white until you held the different wattages and coefficiants up against each other.

This may help with the first image and playing with the falloffs a bit may as well. The open curtain one looks as if its daytime outside instead of night Hope some of this helps.

Incantrix