Thats the way it works. The more you reflect the brighter you are(visibly)
It's very strange... They say it's very nearly both a black body, which means it doesn't reflect any light (at any wavelength, they add) AND it's index of refraction is nearly that of air (which to me means that it's almost totally transparent and doesn't deflect light very much as light passes through it)???? Huh, lol? Very strange stuff!