This was my line of reasoning as well but then again I don't have any experience at all to back it up. I am sure a green dot would work fine otherwise they wouldn't be making them. That said I don't want something that is really awesome in perfect conditions but lack luster in others. I want one that will show up on the brightest of days when it's 99 degrees outside while using less than friendly background colors.
As for now it's all still a theory but that's my logic at least.