Internal hidden profile or "secret spot" is the first in a series of magnets and he actually lit profile, particularly strong in with powerful magnets into the profile and not protruding out.
The profile can be found in lengths of.
30cm with 15W led PHILIPS LUMILEDS
60cm with 30W led PHILIPS LUMILEDS
120cm with 60W led PHILIPS LUMILEDS
Also a light shade is 3000K or 4000K.
Profile color is black or white, or select by the client