In spite of this litecoin halving process having to reduce the rewards which theoretically means reduced supply, this can not have an immediate effect on price as demand isn't constantly there.
But we all expect a slight surge in prices.
It will not reduce the supply but less litecoin will have distributed to the market and that will decrease the inflation that prevents the price of litecoin to go up. A simple theory about that the miners will dump fewer coins to the market.