Both part numbers on this page are the extension body of the 7W Nella, in black and in white, on the 12V DC supply. That is worth reading twice, because neither the title nor the handle says so. The extension is 75mm across and 200mm deep against the standard body’s 100mm exactly double the length, on the same 72mm base plate.

What the extra 100mm is for

Nothing optical changes. Same 7W engine, same 60 beam, same output. What changes is proportion and reach. At 200mm the fitting reads as a slim barrel rather than a puck, which is the point in a room with a high ceiling where a short fitting simply disappears. It also drops the light source clear of a deep bulkhead, a coffer or a heavy cornice that would otherwise clip the beam before it reaches the floor. If neither of those applies, the standard 100mm body does the same job for less money.

Five colours, and a modest spread

The slide switch inside the body gives 2700K, 3000K, 4000K, 5000K and 5700K, measured by Havit at 499lm, 512lm, 558lm, 593lm and 601lm. Output rises with colour temperature across the whole range, but the total spread is about 20% noticeably less dramatic than the 12W body in the same range, which swings by nearly half. Colour rendering is CRI>90 with SDCM<3 binning, so consecutive fittings match each other and the colour holds over life.

Supply, earthing and dimming

These are extra-low-voltage fittings. They take 12V DC from a constant-voltage LED driver, wire in parallel when several share one driver, and Havit prints the limit in capitals: do not connect the light fitting directly to 240V. The fitting is Protection Class 3, so no earth is landed at it which is what makes this version the one specified for vehicles, vessels and wet-area extra-low-voltage circuits. Havit rates the extra-low-voltage models as not dimmable: the directly-wired version of the same body is the Triac-dimmable one, and the two are not interchangeable.

Fitting it, and where it can go

The base plate comes off with an anti-clockwise twist, fixes through two 9 4mm slots on a 72mm, 28mm-deep plate, and the body unplugs from its driver so the plate can be mounted and wired first. Set the colour switch it ships preset to 3000K before the body twists home, because reaching it afterwards means taking the fitting down. It is IP54 and IK08 with a plastic diffuser and >30,000hrs rated life, and Havit excludes aluminium fittings from sites within 5km of salt water. Warranty is 3 years replacement, and Lights For You carries the matching 12W extension body for mixed-output ceilings.

Questions

Is this the standard body or the extension?

The extension, on both part numbers. It is 75 200mm; the standard body is 75 100mm. The title does not say so, which is why the table below lists the size against each part number.

Does the extension give more light?

No. Both bodies use the same 7W engine and give 499 / 512 / 558 / 593 / 601lm with a 60 beam. The extension changes the length of the housing and nothing else.

Which colour setting is brightest?

5700K, at 601lm output climbs from 499lm at 2700K all the way up. The whole spread is about 20%, so on this body the colour choice costs far less light than it does on the 12W version.

What supply does it need?

12V DC from a constant-voltage LED driver. Several fittings on one driver must be wired in parallel, and the fitting must never be taken straight off the house supply.

Does it need an earth?

No it is Protection Class 3. No earth is landed at the fitting, which is why this version is used where an extra-low-voltage circuit is required.

Can it be dimmed?

Havit specifies these models as not dimmable. Any dimming would have to be handled by a driver built for it; the fitting has no dimming circuit of its own.

Is a cut-out needed?

No. The base plate screws to the ceiling surface and the body twists onto it, so the only hole required is for the cable. That is what makes it workable on a concrete slab.