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It is generally a good idea to always use realistic emitter intensities for your emitters. Easiest way is using the emitter presets such as the incandescent 60W light bulb preset. If you feel the emitters in your scene don't emit enough light to properly expose the render, it is tempting to raise the emitter intensity unrealistically to compensate, but very high emitter intensities may result in more noise and "spots". Instead you should change the camera settings that affect exposure (f-Stop, Shutter Speed, ISO).
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