What are you using these figures for would be good and relevant information. As you are with SOLIS maybe its to help with lighting standards and in that case I suppose anyone who looks at the sky with awe and wonder is an amateur astronomer. Thus making many thousands, even the kids who go along to a school organised viewing night, some of whom will be the kids of whom you are trying to impress - and that can have its advantages.
If its to sell/promote something then you are probably only talking in the hundreds who actually put their hands in their pockets.
Use the bigger figure, you can always come down.
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