I suspect one of the problems with floodlights is the associated investment required such as car park lighting and street lighting along the access road, the cost of installing floodlights would be a small part of the overall bill.
Personally as a travelling supporter from Barrow the 3 or 5 starts suits us but wouldn't be keen on a 7 - 7,30 start as sometimes our grandson comes with us and it would be too late getting home.
From a future view if the promotion seriously wants to stage FIM meetings I think lights will be recurred.