The Domus Maxi 40 is a 1.2m suspended LED linear pendant 24W, 2400lm, 4000K atCRI90, dimmable, in a white body with a low diffuser.

Made to order, and no lead time is published

Domus asks you to call and confirm it and on a retrofit the oldfitting comes down before the new one arrives. Settle it first.

Replacing a 4 ft fluorescent batten the comparison in full

• The raw lumen comparison looks unfavourable and is misleading. A barefluorescent lamp’s output is measured at the lamp, and an open batten throws a large share of it sidewaysand upward where it does little work while this fitting’s 2400lm isdirected downward at 120.
• So compare the working plane, not the datasheet. We would still not claima one-for-one swap without checking your space tell us the mounting height andthe existing fitting and we will work it through.
• Where the change is unambiguous: the power drops from about 85W to 24W, thecolour rendering improves, and the flicker and warm-up of a fluorescent tube go away.

Three practical differences to plan for

• It is SUSPENDED, not surface-mounted a 3m drop issupplied and shortened on site, but it will hang below the ceiling where a batten satagainst it.
• The fixing is different suspension points into structure ratherthan screws into the ceiling lining, and the spacing and weight are notpublished.
• No lamp. Tell whoever maintains the building a 3-year replacement warranty covers the early years, and the rated lifespan is notpublished.

Where it works

• Replacing 4ft battens in offices, workrooms and back-of-house.
• Single desks and workstations.
• White plasterboard and grid ceilings.
• Not where headroom is tight it hangs below the ceiling.
• Not anywhere damp IP20.

Specifying it

1.2m suspended LED linear pendant. 2400lm, 24W (100lm/W), 4000K,CRI90. 120 down-only. IP20. 1200mm. 3m drop. PLEX-COB-20W strip, integral dimmable driver,DALI and emergency on request. White body, low diffuser. 3-year replacement warranty. Order codeMAXI-40-1.2M-LD-W-4K. SKUs 3012530128. 240V. AGAINST A TWIN 36W FLUORESCENT BATTEN: about 85W down to 24W, 59lm/W upto 100, and CRI8085 up to CRI90. The raw lumen figures look unfavourable and are misleading a barelamp is measured at the lamp, and an open batten throws much of that sideways and upward, where thisfitting directs all 2400lm downward. Compare the working plane, not the datasheet tell us themounting height and we will work it through.

Supplied and supported by Lights For You.

Questions

Can this replace a 4ft fluorescent batten?

It is a sensible replacement, and now the comparison can be made properly. Input power drops from about 85W for a twin 36W batten with gear to 24W. Efficacy rises from roughly 59 lumens per watt at the lamp to 100. Colour rendering improves from a typical CRI80 to 85 up to CRI90. And the flicker and warm-up of a fluorescent tube go away.

But the batten produces more lumens is this a downgrade?

The raw comparison is misleading. A bare fluorescent lamp’s output is measured at the lamp, and an open batten throws a large share of it sideways and upward where it does little work. This fitting’s 2400 lumens is directed downward at 120 degrees, so far more of it reaches the working plane. Compare the working plane rather than the datasheet though we would still not claim a one-for-one swap without checking your space. Tell us the mounting height and the existing fitting and we will work it through.

What changes physically?

Three things. It is suspended rather than surface-mounted, so it hangs below the ceiling where a batten sat against it a 3m drop is supplied and shortened on site. The fixing is different: suspension points into structure rather than screws into the ceiling lining, and the spacing and weight are not published. And there is no lamp, so when it fails the fitting is replaced.

What should I tell the maintenance team?

That there is no tube to change. The old batten had lamps replaced periodically; this has none, so a failure means a new fitting. A 3-year replacement warranty covers the early years, and the rated lifespan is not published worth asking us for if you are building a maintenance schedule around it.

Is 4000K the right choice for a retrofit?

Usually, because it is close to what a standard fluorescent tube delivered, so the room does not change character. 3000K in a space people are used to seeing under cool white reads as dim even when it is not. It is also the more efficient option here at 2400 lumens against the 3000K version’s 2160 for the same 24W.

Will the colour rendering be noticeably better?

Yes, and it is one of the clearer wins. CRI90 against a typical fluorescent CRI80 to 85 means materials, print and finishes read more accurately reds in particular, which is where lower-CRI sources fall down most visibly. In a workroom or a space where anything is inspected, that is a real improvement rather than a specification detail.

Can I use it in a damp space?

No IP20, dry interior only. Many batten locations are damp or dusty, so this is worth checking before a like-for-like swap. For those positions, ask us about the Domus IMPACT range at IP66 and IK10.