"But in some other places it certainly has a big bearing on the game."
Of the idea of Tests being reduced to four-day games, Lehmann said: "I don't mind it".
But he forecast issues with longer daily playing hours and getting teams to bowl more overs in a day.
"We don't bowl our 90 overs in a day as it is, so that is probably the only thing," he said. "But I'm open to all those sorts of things. Whatever makes the game better for the fans is pretty important."
Lehmann said he "loved" the inaugural day-night Test against New Zealand in Adelaide.
"I thought it was a great concept," he said. "It was probably over a little bit quick for my liking in terms of the game but it was exciting for three days and it could have gone either way.
"Maybe a little less grass (on the pitch) and maybe get the ball a little bit darker in the seam, but it's only a little bit of tweaking.
"I was quite impressed by it. I know the fans loved it ... we have just got to make it better."
-AAP