M05 was a level with a slightly complicated visual narrative. You were on the planet Helghan but located in the Vektan embassy building. However this level had been retaken by the Helghan's. Art wise this meant we were trying to make things look a little less harsh and brutal than typical Helghan architecture. Elements like the cherry blossom trees were also a nod to this.
I was the lighting artist for the level. To go with the themes above we tried to strike a balance of making this level almost feel like a warm, brightly lit day, it's definitely the closest to a pleasant feeling atmosphere of the Helghan levels. This meant by far the most work in the level was in getting the sunlight and bounce feeling believable, manmade lights were only used as minor light sources.
Killzone Mercenary - Walkthrough "Diplomatic Incident"