I'm planning to photograph a family in their living room, with either everyone sitting in a fairly formal arrangement, but also pictures of the children playing, etc. I have experimented using just the window light to take portraits of the children playing and this works but the shadow contrast is quite high and the light varies a lot from position to position; a picture of several people would work badly using just the window light. The living room is quite large (about 50m^2), and there is a single window on each of three walls (the windows are relatively small compared to the area of the walls). There is a fireplace on the fourth wall, and the corridor to kitchen opens next to the firewall I don't need to light the whole room but I would like there to be enough space so that there can be some action and the light should be even enough so that I don't need to adjust lights to compensate all the time. I think if I could augment the window light sufficiently that there is a relatively evenly lit area of 30m^2 (about half of the room), I could work with that. Now the question is what should I use as additional light? I have only experience with lighting very small areas such as those for macro or for portraits of 1-2 people. I'm thinking of a skylite panel and a couple of speedlights behind it with umbrellas. This would be on the fireplace side, orthogonal to the main window in this area of the room. I can't decide on the size of the panel to get; I think using the 2x2m panel would require multiple speedlights and still I'm not sure if I can light it all that evenly. A studio flash with an octa bank would be another possibility but I suspect it would be too powerful to balance with the window light - typically window light can be as low as f/2.8 1/200s ISO 800 on a rainy day. I think the walls, roof, floor are not very neutral and bounced light would have some color. I would like to retain as much of the character of the room so using flash as the only source of light isn't compatible with that with the lighting resources that I have. Using high ISO isn't a problem (D700). Thanks for your suggestions.