How to reduce the glossy noise? I am using a lamp with shader glossy, without the lamp the scene is good, but when I bring the lamp with the shader increases the amount of noise. what do I do?
You can render less noisy image increasing the render samples, you can also use set clamping to reduce fireflies (very bright pixels, getting brighter with more samples). If you have glossy / metallic surfaces don't set the clamping too low (below 1.5) because it makes the metallic surfaces dull.