<a href=showthread.php?s=&postid=14857980#post14857980 target=_blank>Originally posted</a> by PaulErik
All of the blue lamps ATI blue plus, Giesemann actinic plus and other 450nm/460nm lamps are generally considered 20,000K +. They give off nice pop to fluorescent pigments in corals and appear very bright blue when used alone. Personally they appear more monochromatic blue than 20,000K halides to me.