room height COB LED grow

With HPS a loot of height is needed because ligths are hot, cannot be too close to plant, bulbs etc. takes up space.

COB LED are much smaller, much less hot, light can be spread more even, etc. So my question is: what is a good room height for a COB LED grow room? from floor to ceiling.

LED will result in major changes in how to design a good grow room, right? Everything is still based on HPS in terms of space, heat, power ....