"If a bird flew just above the beam director during operation, the power density it would experience is 1,000 times lower than at the rocket, which is well abov

"If a bird flew just above the beam director during operation, the power density it would experience is 1,000 times lower than at the rocket, which is well above the altitudes of birds and planes" Can someone explains me that? It doesn't sound very intuitive to me.. I'm surprised the Army isn't throwing money at projects like this, it looks a lot like the High Energy Liquid Laser Area Defense System. Edit: Nevermind, I forgot the beam would be shaped like a cone, sent from a very big transmitter.