I here, suggest high quality lights from the Catalogue of Besselink & Jones which maybe suitable for your bookcases.  I may be able to incorporate these in your designs provided the width of the pilasters etc. are agreed at our initial meeting and they are wide enough to take the light of your choice.  If a suitable light is suggested then you buy direct from Besselink and Jones for fitting by your electrician after delivery.  Please check with Besselink & Jones that they are available and confirm size of the base plate which your electrician will fit the bookcase pilaster or panel works.  These illustrations are for guidance and  as suggestions only.  I understand that they may be supplied in polished, distressed and verdigris brass finishes.