Can't hide lights from being displayed

hy guys,
im facing this problem: i have an “area lamp” (plane emitter w/ cycles) but can’t have it just displaying its light w/o being shown in glasses and mirrors.
i have disabled “camera” view, but id i disable “glossy” as well it stops casting correct amount of lights… isn’t it?

ty

upping…
is there any chance to avoid this issue?

ty,