How much of a difference does 'Lightbridge' make? (DJI Drone question)

[Stab]

For our wedding film business I am in the market for a drone. I have played around with some footage of a DJI Phantom 3 4K and it looks really good to me. I could settle for this.

With the DJI Phantom 4 on the market, the price of the '3' has settled and it looks very tempting now.
So I narrowed it down to the DJI Phantom 3 4K and the Professional version.

It seems that the only real differences are that the Pro version has a higher resolution streaming and that it has Lightbridge where the non-pro version doesn't. Or am I missing something?
So, in practice, how much of a difference is this? How is the connection in the non-pro version? Does it lose it's signal? Or does it just have fewer range? And how much would that range be?

The Pro version is still 999 euro's in my country, whereas the non-pro version is 630... Pretty big difference.

Anyone have any experience or knowledge about this? Would the 4K non-pro version be good enough for shooting weddings and flying limited distances? 

[dafreaking]

http://www.drone-world.com/phantom-3-standard-4k-advanced-professional/

I've only used the pro and the advanced so can't comment on the disconnection. If you aren't flying to far out it should be ok I guess