Red light panel size and coverage
Panel size is mostly a question of convenience and coverage. A larger panel can expose more area in one position. A smaller panel takes less space and can be easier to aim at one area.
Start with the area you want to cover
Think about the body area you expect to use most often. A face or single joint calls for much less coverage than the front or back of the torso. Buying around the real treatment area is more useful than chasing the largest panel that fits the budget.
Physical size is only part of coverage
Distance, beam pattern, LED layout, and panel orientation affect how light spreads. Compare the manufacturer treatment area and recommended distance rather than using cabinet dimensions alone.
Think about repositioning
A compact panel can still work for broader routines if you are comfortable repositioning it or yourself. A taller system can make the routine simpler, but it also needs more wall or floor space.
Measure the room before ordering
Check the panel dimensions, stand footprint, door clearance, outlet location, and the distance you will stand from the light. This catches practical problems before a heavy panel arrives.