The Pulsating Lamp is a set of blocks added by Dazzle. When powered by a redstone signal, it emits light at value 15. They can be inverted by using a Redstone Torch on the block, which will cause it to emit light at value 15 unless powered by a redstone signal.
They break instantly regardless of the tool used to break them.
They have an animated texture with a pulsating colored square on the top and bottom and a colored rectangle which circles the sides of the block.