Hi,
Red637nm is single-mode LD, while 520nm and 462nm are multi-mode LDs. It is normal that multi-mode LDs has vignetting(tail) round the beam spot, as you can easier find a photo in this forums.
But we checked the photo you posted, it seems a bit unnormal. We want to check more photos of further distance as I have replied you email to follow up this issue. if it confirms quality problem or caused by shipping problem, Lightspace will be responsible!
Thanks!
Omar
www.eightonlight.cn
info@eightonlight.cn