Ceiling height is the more determining factor than room square footage. ISTR, in the olden disco days there was a rough formula/ratio for ceiling height vs. ball diameter, but I don't remember what it was.Any rule of thumb for sizing mirror balls?
Provided the bottom of the ball is at least 8'-0" AFF. Don't want the ravers knockin' their noggins.The bigger the better.
The speed of the rotation depends entirely on the motor used, but in general, if you were doing a side-by-side test of two mirror balls (one 8" and one 12", both on identical motors), the 8" will appear to spin faster because each mirror tile has a shorter distance to travel to achieve a full revolution.
Are you sure this is the case? The larger balls diameter would make the surface of the ball effectively be travelling faster & hence the dots of light would move faster.
The 12" would be fine for a 20 x 20. An 8" would work also, but you get a lot of wasted light because typically the beam of the pinspot will be larger than 8" diameter when it meets the mirror ball. So you might have light spilling around the mirror ball also. The speed of the rotation depends entirely on the motor used, but in general, if you were doing a side-by-side test of two mirror balls (one 8" and one 12", both on identical motors), the 8" will appear to spin faster because each mirror tile has a shorter distance to travel to achieve a full revolution.
Since you seem to be concerned mostly about speed, what you really need to be looking at is motors and not mirror ball sizes. Take note of RPM's and keep in mind that there are DMX versions out there in which you can control the speed though a lighting console.
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