Surface-mounted LED panels: sizes, wattage, installation and recessed vs surface

Short answer: A surface-mounted LED panel is screwed directly onto the ceiling instead of being recessed, and has its own housing. It is the choice for solid concrete ceilings without a suspended ceiling, or when you want to upgrade lighting without building work. Square models usually come in 300×300, 300×600, 300×1200 and 600×600 mm; a 600×600 surface panel is typically 36–42 W. The housing is slightly larger and deeper than a recessed panel. Installation should be done by a qualified electrician.

What is a surface-mounted LED panel?

A recessed panel sits inside a suspended or plasterboard ceiling and needs a cut-out and space behind it. A surface panel carries its light source, diffuser and usually its driver in its own frame. The frame is fixed to the ceiling and the wiring is connected inside it. No cut-out, no ceiling grid.

The visible difference: a recessed panel is flush with the ceiling, a surface panel projects a few centimetres. Depending on the model, the surface panels we stock are roughly 40–85 mm deep.

When should you choose surface mounting?

• Concrete ceilings: if there is no suspended ceiling and none is planned, surface mounting is the practical option.
• Upgrades without building work: remove the old fluorescent fitting and mount the panel on the same point.
• Rented offices and shops: easy to fit and remove without altering the ceiling.
• Stores, workshops, stairwells: ceilings with beams or no void for recessing.
• Damp and dusty areas: a sealed IP65 surface panel is more suitable than an open recessed one.

In an office with a grid ceiling, recessed or lay-in panels look cleaner; see our guide on 600×600 LED panel wattage.

Can a recessed panel be surface mounted?

There are separate surface-mount frame kits that fit around a recessed panel. They work, but the kit must match the panel's brand and size, an external driver must sit safely inside the frame and heat must be able to escape. With a mismatched kit, the panel does not seat properly, light leaks at the edges or the driver is squeezed.

The simpler route is a panel designed for surface mounting from the start. On the Lamptime surface models we sell, the housing is part of the product, so no extra kit is needed.

Sizes: square, rectangular and round

Square and rectangular panels:

• 600×600: the most common size. Lamptime PB13 measures 625 × 625 × 68 mm, while the recessed PB10 is 596 × 596 mm. Surface housings are a few centimetres larger.
• 300×1200: corridors, offices, storage. PB13: 337 × 1130 × 68 mm.
• 300×600 and 300×300: small rooms, entrances.

Small round and square panels (downlight type):

• Lamptime DS12 round: Ø118, Ø170, Ø220 and Ø300 mm, 40 mm deep, 6–24 W.
• Lamptime DS13 square: 118×118 to 300×300 mm, 40 mm deep, 6–24 W, with an IR sensor option.
• Lamptime DB12 round and DB16 square: Ø190–Ø240 and 240×240 mm, 20–30 W, backlit body.

Round surface panels suit hallways, bathrooms, kitchens and entrances with a single central ceiling outlet.

How many watts and lumens?

Approximate guide values:

• 600×600 surface panel: 36–42 W (PB13 options from 20 to 42 W).
• 300×1200: 36–40 W.
• Ø170 round: about 16 W; Ø300: about 24 W.

Efficacy varies by model; roughly 80–100 lumens per watt is a reasonable estimate. The exact lumen value is in the product data. To work out how many panels a room needs, use the simple formula in our lighting calculation guide.

Built-in or external driver?

An LED panel needs an LED driver. In surface panels the driver usually sits inside the housing, so you do not need space in the ceiling. Recessed panels usually have the driver behind them in the ceiling void.

Our Lamptime panels are available with a standard or European-made (EU) driver, DALI dimming and an emergency kit. See choosing an LED driver.

Glare (UGR) and diffusers

For screen work a low glare value is expected; UGR < 19 is a common target. Plain opal (PS) diffusers may glare more; PMMA diffusers and lens optics control light better. The Lamptime PL12 lens surface panel comes with 50° and 80° optics. Check the UGR in the product's own documentation, and see our guide to office and shop lighting.

IP rating for bathrooms and damp areas

• IP20–IP40: dry indoor rooms.
• IP65: dust-tight and protected against water jets; bathrooms, car parks, storage, back kitchens and semi-open areas.

The Lamptime PH12 surface panel is IP65 in 600×600, 300×600 and 300×1200; DB12 and DB16 have an IP65 option. In bathrooms the required rating depends on the zone; see bathroom lighting zones and IP ratings. Local wiring rules (IEC 60364 based) apply.

Installation steps

Have a qualified electrician make the connection. The general order:

1. Switch off the circuit breaker and confirm the line is dead with a tester.
2. Remove the old fitting and check the ceiling outlet and junction box.
3. Hold the mounting plate or housing in place and mark the holes. Use wall plugs for concrete and suitable plasterboard fixings for drywall.
4. Screw the housing in place and bring the cable through the cable entry.
5. Connect live, neutral and, on Class I panels, earth. PB13, PH12 and DB12 are Class I and need an earth connection; DS12, DS13 and PE12 are Class II.
6. Fit the diffuser or front frame, switch on and test.

Surface panels in our range

In our LED panel category:

• Lamptime PB13 and PB23: backlit surface panels, 300×300 to 600×600, IP40.
• Lamptime PE12: slim (45 mm) surface panel, IP20.
• Lamptime PH12: surface panel, IP65.
• Lamptime PL12: lens surface panel 600×600, 40 W.
• Lamptime DS12, DS13, DB12, DB16: small round and square panels.

Colour temperature is selectable from 2700 to 6500 K. ENGN is an authorised Lamptime dealer with a shop in Nilüfer, Bursa, and installs lighting in Bursa.

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