One Opening More Than One Beam
A grille module puts two or three adjustable heads behind a single ceiling opening. For a long wall bay that is the difference between one clean cut and three separate holes that never quite line up.
It also means the heads can be aimed independently: one onto the wall display, one onto the floor stock in front of it.
Choosing By Opening Length
The catalogue's rectangular openings step as follows. Twin modules: 125 x 60, 162 x 81 and 210 x 102 mm. Triple bars: 178 x 61, 241 x 81 and 317 x 102 mm.
Pick the opening from the bay width first. A 317 mm triple bar covers a wide bay from a single point; a 125 mm twin suits a narrow bulkhead or a niche.
Matching Power To Ceiling Height
Head power scales with the module size. The smallest twin and triple units run 5-7 W per head, the middle sizes 7-15 W, and the largest 24-30 W per head.
For a 3 m ceiling the smaller heads are usually enough. Above 4 m, the 24-30 W heads with a 15° or 24° optic are the ones that will still have intensity at shelf level.
Bordered Or Trimless
Both are available. The bordered square heads cover a site-cut opening and can be re-seated; the trimless modules are plastered in for a flush ceiling.
In retail the usual split is trimless on the shop floor and bordered in stockrooms and back of house.
Typical Retail Layout
Perimeter bays take triple bars spaced to the bay module. Mid-floor gondolas take single square heads or round spotlights. The window takes track so it can be re-aimed. Cash desk and fitting rooms take wider optics.
Keeping the grille and spotlight families to one cutout ladder means the whole layout can be built from two or three hole sizes.
