It makes the engerneers job more quicker in the morning to see the green light so he knows it's working properly then taking a key and manually turning them all on one by one every morning as the ride can not open if they don't work and I'm also sure they have the green lights in all there building can you imagine how long a ride like X will take if he has to go round manually turning them on every morning it never open by 9:30 or 10:00
And no it makes not a massive diffrent a it still very dark in the tunnel