An interesting change in apparent brightness and to some degree form will result — what may be called a «here comes the sun» effect. (illusioncontest.neuralcorrelate.com)
The huge concentration of mass bends light coming from more distant objects and can increase their total apparent brightness and make them visible. (sciencedaily.com)
Even though most of the visible radiation is concentrated in a few discrete emission lines, the total apparent brightness of the brightest is the equivalent of tens of thousands of solar luminosities. (britannica.com)