I'm a sound guy by trade most of the time, although I do enjoy lighting work too. I'm standing in for my boss who's on an extended vacation and had a question come up that I need help answering. A show coming in is looking at our FOH lighting inventory, all of which is indicated in degrees of beam width (19 and 24 degree Source 4), it's silk screened right on the end of the barrel. That's fine I understand that. The LD for the show is looking for more ellipsoidals, but is referring to them dimensionally, as 6x9s or 6x12s. I understand those terms also but am having trouble making the conversion between dimensionals and degrees. I've worked in venues that use one term or the other but never had to mix them. Is there a conversion chart that someone could post, something like a 6x9 is an xx degree instrument?
Thanks in advance
Matt
Thanks in advance
Matt