Commuting to London i don't have the light problem,the train takes the strain and i only live just over a mile from the station so i tend to walk in. I did used to have a bike i kept in London to commute to wherever i was based and i remember when crees really got trendy. Now central London is light 24/7 365 your bike lights are used to be seen not to see by but there were plenty of nut job TdF wannabes with full on crees cycling and blinding everyone standing.
I don't commute in town anymore, my adrenalin levels are back down to not normal rather than you should be dead levels.