The Domus PANEL-BLT-312 is a 1,200300mm backlit LED paneldrawing 36W, with a flicker-free driver and switchable3000K / 4000K / 5700K, in Trio orDALI.

One thing to settle before specifying the DALI version. Ourrecord says this fitting is not dimmable, and it also offers aDALI variant. Those two statements cannot both be right DALIexists to dim and address fittings digitally, and that is the whole reason to pay for it.

The same contradiction appears on the 300300mm panel in thisrange, so it is a range-level record problem rather than a one-off.If you are specifying the DALI version into a control system, confirm the dimming behaviour withus first. The Trio version has no such ambiguity: it is set by dip switch and it is notdimmable.

The 1200 300 format, and what it is for

• It replaces a standard fluorescent troffer the twin-tube batten fitting thatsits in most older commercial ceilings.
• It drops straight into a T-bar grid in place of a1,200300mm module, or goes into plasterboard with an optional trim kit, orsurface-mounts or wire-suspends with another kit.
• 3,415lumens at 4000K from 36W about 95lm/W, andcomfortably more light than the twin 36W fluorescent it replaces at half the power.
• It is 32mm deep. In a grid ceiling that is irrelevant; in a shallowplasterboard void, check it.

Backlit, not edge-lit and on a long panel it matters more

• The LEDs sit behind the diffuser across the whole area, rather than around the rimfiring sideways into a light guide.
• On a 1,200mm panel that is the difference that shows. An edge-lit panel thislong has to push light the full length from its ends, so the centre reads dimmer and banding is morevisible. A backlit one is even across the whole face.
• No light guide to yellow over five or ten years, which is what makes old edge-litpanels go warm and dim.
• It is also more efficient, because the light does not travel across a panel beforeit escapes.

The flicker-free driver

Domus fits a harmonic filter to reduce total harmonic distortion the cause ofvisible strobing and of the eye strain and headaches some people get under cheap LED panels.

• It matters most in exactly the rooms this panel goes into offices,classrooms and workshops, where people sit under it for eight hours.
• And where cameras are used, because flicker shows as banding on video.
• It is a real specification difference, not a marketing line: standard drivers thatare not flicker-free are why panel lighting has the reputation it does.

The numbers

• 3,010lm at 3000K, 3,415lm at 4000K, 3,200lm at5700K from 36W.
• 1,19529532mm, white frame, opaldiffuser.
• CRI 80, high-efficiency SMD, 40,000hours,IP20.
• Its datasheet carries a warranty disclaimer that is cut off mid-sentence in everycopy we hold. The warranty is three years; the condition attached to it we cannot read, so askus and we will get the full text from Domus.

Choosing the colour

• 4000K the default for an office, classroom or corridor, and thebrightest setting here.
• 3000K reception areas and anywhere the space should feel lessclinical.
• 5700K workshops and inspection areas.
• The Trio’s dip switch is attached to the cable of the fitting, so set it before thepanel goes into the ceiling.

Where it works

• Offices, classrooms and workshops flicker-free matters where people sit for hours.
• Replacing 1,200300mm fluorescent troffers in a grid ceiling.
• Corridors and back-of-house.
• Spaces with cameras no banding on video.
• IP20 dry interiors only.
• Confirm the DALI variant’s dimming behaviour with us before specifying it.

Specifying it

1,19529532mm backlit LED panel for a1,200300mm grid module. 36W giving3,010 / 3,415 / 3,200lm at3000K / 4000K / 5700K, switchable. High-efficiency SMD,CRI 80, 40,000hrs. Flicker-free driver with a harmonicfilter. 240V AC, IP20. White frame, opal diffuser.Trio (dip switch on the cable) or DALI. The record says not dimmable whileoffering a DALI variant confirm before specifying into a control system.Recessed into a grid ceiling, or plasterboard / surface / suspended with optional kits.Warranty 3 years its datasheet’s warranty disclaimer is truncated in every copy wehold; ask us for the full condition.

Supplied and supported by Lights For You.

Questions

Is the DALI version dimmable?

It should be that is what DALI is for but our record says this fitting is not dimmable while also offering a DALI variant, and those two statements cannot both be right. The same contradiction appears on the 300 300mm panel in this range, so it is a record problem rather than a one-off. If you are specifying the DALI version into a control system, confirm the dimming behaviour with us first. The Trio version has no ambiguity: dip switch, not dimmable.

Will it replace my fluorescent troffer?

Yes that is the format. It drops into a standard 1,200 300mm grid module in place of a twin-tube batten, and at 3,415 lumens from 36W it gives more light than the twin 36W fluorescent it replaces at about half the power. It is 32mm deep, which is irrelevant in a grid ceiling but worth checking in a shallow plasterboard void.

What is the difference between backlit and edge-lit?

Where the LEDs sit. Backlit puts them behind the diffuser across the whole area; edge-lit puts them around the rim firing sideways into a light guide. On a 1,200mm panel that difference shows an edge-lit panel has to push light the full length from its ends, so the centre reads dimmer and banding is more visible. Backlit is even across the face, more efficient, and has no light guide to yellow over ten years.

What does “flicker-free” actually mean here?

Domus fits a harmonic filter that reduces total harmonic distortion, which causes visible strobing and the eye strain and headaches some people get under cheap LED panels. It matters most in exactly the rooms this panel goes into offices, classrooms and workshops where people sit under it for eight hours and in any space with cameras, because flicker shows as banding on video.

Which colour temperature should I choose?

4000K for an office, classroom or corridor it is the default and also the brightest setting here at 3,415 lumens. 3000K for reception areas and anywhere the space should feel less clinical. 5700K for workshops and inspection areas. On the Trio the dip switch is attached to the fitting’s cable, so set it before the panel goes into the ceiling.

What is the warranty?

Three years but its datasheet carries a disclaimer that is cut off mid-sentence in every copy we hold, so there is a condition attached that we cannot read. We are not going to summarise a condition we have not seen. Ask us and we will get the full text from Domus before you order.

Can it go in a bathroom or a covered outdoor area?

No. It is IP20, which is dry interiors only. For a damp location you want a weatherproof batten or a rated panel, and we can point you at one.