I have often seen where people neglect these things, and end up cranking emitter output values, or camera values, to unrealistic ranges to try and compensate, and this puts things out of balance and generally yields subpar results, and loss of performance. Not saying you are doing that - rather your impulse to want to crank up the power of the lamp suggests to me that you have chosen a not-unrealistic output value for the lamp, and that your scene is indeed modeled at correct scale. Since for example, it will mean little to say an emitter puts out 100W, when the scene has been constructed at say 1/10 its real size. This hints at another rule, that the physicality of bella's camera/lights/etc requires models to be constructed using correct scale. We don't usually notice this with our eyes because they have a high dynamic range, and adjust quickly as we scan across a room. On that, I'll mention that just like with real photography, it will not be possible to find an exposure that lets you see much influence from the lamp, without also causing the exterior visible through the window to be blown out.
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