The Flow LED Downlight is a COB recessed fixture built around one specific advantage at its entry size: the 8W version uses a D24mm cutout, notably smaller than the D42mm cutout on Focus at the same 8W output — the tightest ceiling opening in T21's Type B accent range. The 15W (D58xH85mm) and 20W (D70xH105mm) sizes match Focus's dimensions exactly. White, Black, Shine Black, or Antique Gold.

Ceiling structures with limited joist spacing, shallow voids, or existing services running close to the surface sometimes can't accommodate a D42mm cutout without relocating something — Flow's D24mm 8W option solves exactly this problem, delivering the same 8W COB output and finish range as Focus in a cutout roughly half the diameter. Once wattage steps up to 15W or 20W, the size difference disappears and both products share identical dimensions, since the mechanical space needed for higher output converges regardless of manufacturer design choice.

Electrical contractors specify Flow over Focus specifically at the 8W tier when ceiling void constraints are known in advance — for retrofit projects into existing ceilings, or new-build ceilings with tightly packed services, the smaller cutout avoids a redesign. Electrical drawings for retrofit projects should specifically note the D24mm cutout requirement at the 8W tier when specifying Flow, since this detail differs meaningfully from the standard D42mm assumption most contractors default to for comparable wattage COB fixtures.

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Why does Flow's 8W cutout differ so much from Focus's 8W cutout when both are COB downlights at the same wattage?

The difference reflects a specific engineering choice at the entry wattage — Flow's 8W is built around a D24mm cutout, while Focus's 8W uses D42mm. Both deliver comparable COB light quality at that wattage; Flow trades slightly more compact internal componentry for a significantly smaller ceiling opening, useful where cutout size is constrained.

Should I specify Flow over Focus for a project with unknown or generous ceiling void depth?

Where ceiling constraints aren't a specific concern, Focus and Flow perform equivalently at 15W and 20W since dimensions match exactly. Flow's advantage is specifically the 8W tier's compact cutout — for that size in a constrained ceiling, Flow is the better fit; otherwise either product suits the application equally.

Should electrical drawings specifically call out Flow's compact 8W cutout, or is standard COB cutout sizing assumed?

Yes, explicitly note the D24mm cutout requirement on drawings when specifying Flow at 8W, since contractors may otherwise default to the more common D42mm assumption used across most comparable Type B fixtures, leading to an oversized cutout being prepared unnecessarily.