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