Greg: I am trying to substitute the flash units I use with studio lights of equal or higher luminosity. The guide number doesn't give me an idea of how much lighting the flash unit provides in terms of luminosity when compared to a standard lighting fixture used for studio lighting. Studio lights are usually sold and measured in terms of either Watts or Lumens and I need to find out how the different flash units I usually use compare to this lights. Best regards, Joseph Chamberlain, D.D.S. Oral and Maxillofacial Surgery ---------------------------------------------------------------------------- On 4/22/05 5:20 AM, "Gregory Fraser" <Gregory.Fraser@xxxxxxxxxxx> wrote: > > : How can I convert a flash guide number to Watts and Lumens ? What > conversion > : formula can I use for this ? > > If you don't mind my asking - why do you want to do the conversion? > > Greg
