The Redstone Lamp is a block resembling Glowstone. When powered using Redstone the redstone lamp will let off a luminance of 15.
Unlike Glowstone, when Redstone Lamps are broken they will yield that actual block not Glowstone Dust. Redstone lamps can be used as an attractive and functional light source. Where the lamps are hooked up to a switch, caution should be used when leaving the room with the lamps off, as mobs are able to spawn in unlit locations