Is your map looking a little bit flat? Does it need that extra zing? Then High Dynamic Range can help you add that warm glow to your creation.
HDR is a subtle effect; a simple explanation is that is the effect of your eyes adjusting to a dark room after being in the bright outside. This means that darker areas will be darker initially, and will then rise to a brightness level more suited for interior gameplay. This dynamic balance of brightness adds contrast to your map, meaning an overall brighter and vibrant experience.