^actually short power outage, and because of their use of probe-start MH lamps, these "Power failures" are actually noting but short power outage that leads to infinite time cooling down and hot restrike of the lamps?
Look at this video for example: https://www.youtube.com/watch?v=iyPJWs8CF8w

This don't occurs in any stadium outside North America, that don't use probe-start lamps.

all hid lamps needed time cooling down  before it can restrike.  due to pressure in arc tube.

But most sport MH lighting in Europe, use MH lamps that have much shorter hot restrike of only several min or even 60KV ignitors for instant hot restrike. I'm hearing of such types of "power interruptions" in sport fields, only from the US.

That wouldn't happen with an LED re-fit 

But most sport MH lighting in Europe, use MH lamps that have much shorter hot restrike of only several min or even 60KV ignitors for instant hot restrike. I'm hearing of such types of "power interruptions" in sport fields, only from the US.

The 230V mains and the efficiency of just a series choke means the pulse start MH's with way shorter restrike time became the mainstream in Europe. The instant restrike capability is then just a matter of higher ignition voltage, so just an extra ignitor a modified lamp holder/connection (to handle that voltage; but the high power rating so high temperature operation usually needs similar socket style anyway). Hence the popularity of the instant restrike systems in Europe...

In the US any MH needs some transformer style ballast, so making the secondary OCV a bit higher to allow to get away without any ignitor with probe start lamps. But the extra electrode means larger, so way heavier seal, so those designs have way longer thermal inertia. Plus the need of the probe cut off contact means the lamp has to cool down way below the temperature where it would inherently restrike, making the overall restrike time of the probe MH really very long.

This is why many fields have a mixture of HPS and MH-  The HPS will restrike quickly or activate immediately once a power failure has taken place on the MH circuit, so there is some basic lighting until the MH cools down enough and fires up again.  They will turn off the MH at the end of the games and use HPS for the cleaning crews to do the work. 

The 230V mains and the efficiency of just a series choke means the pulse start MH's with way shorter restrike time became the mainstream in Europe. The instant restrike capability is then just a matter of higher ignition voltage, so just an extra ignitor a modified lamp holder/connection (to handle that voltage; but the high power rating so high temperature operation usually needs similar socket style anyway). Hence the popularity of the instant restrike systems in Europe...

In the US any MH needs some transformer style ballast, so making the secondary OCV a bit higher to allow to get away without any ignitor with probe start lamps. But the extra electrode means larger, so way heavier seal, so those designs have way longer thermal inertia. Plus the need of the probe cut off contact means the lamp has to cool down way below the temperature where it would inherently restrike, making the overall restrike time of the probe MH really very long.

Thanks. I always wondered about this. In most cases when I hearing about a power interruption during sports match in the US, the length of the power interruptions looks very typical of the hot restrike of 1500W and 1650W probe-start MH lamps.