From a lighting point of view: Reflective material has a huge influence on the light levels and uniformity of lighting of the room. The smaller the room, the bigger the influence. I can explain the latter with a simple ratio (and apologies for the metrics in here):
a 1x1m small tent has 4x1m walls: Ratio space to wall is 1:4
a 2x2m room hast 4x2m walls: Ratio space to wall is 1:2
a 10x10m room has 4x10m walls: Ratio space to wall is 2.5:1
In a small room the wall losses can be as high as 30-35% easily. Specifically because most small rooms/tents are square and almost all HPS fixtures have a rectangular throw.
Now LEDs with a limited spread have an advantage of not lighting the walls too much in a room, but you need much more distance to the crop to get an even lighting.
We recommend to always use Orca film or compatible products. In a small room that saves you even up to 20% of light in your room, in a large room the percentage is lower but the quantity of light you save is much higher.
As for uniformity it allows 5-20% better uniformity of light in a room.
White paint has a reflectivity of maximum about 83% (unless you use the super expensive Barium paint that we use in our Ulbricht sphere, which is 97), Orca does 95/96%. It is a great investment and you will actually see the difference.