How to specify LED mirrors for a hotel bathroom project

A hotel bathroom mirror has to survive a cleaning schedule, a hard water supply, a mains voltage that varies, and hundreds of guests. Here is the specification we work to, and the six decisions that are usually made too late.

Most hotel bathroom mirror problems are not visible in a sample and are not expensive to fix at the specification stage. They are expensive to fix after two hundred units are on site.

Below is the checklist we work from when a project buyer sends us a bathroom mirror brief. It is written in the order the decisions actually need to be made, because several of them constrain the others.

Decision 1: where does the power come from?

This is the first question, and it is the one most often left until the shop drawing. There are three arrangements in real hotel work:

• Hard-wired with a concealed supply. The supply is built into the wall cavity and the mirror is hard-wired. This is the correct choice for a permanent hotel room: no visible plug, nothing to unplug, nothing for a guest to break. It requires coordination with the electrical contractor at the fitting-out stage — if that coordination is late, the option is gone.
• Built-in wide-voltage supply with a certified plug. The transformer and driver are inside the mirror housing, and a short lead with a plug runs to a socket concealed behind the mirror or in an adjacent vanity unit. Common in serviced apartments and in refurbishment projects where the walls are already closed up.
• External adapter. The adapter sits behind the vanity unit, outside the mirror body. Fine for a bedroom vanity or a domestic project; for a hotel bathroom we would not specify it, because it becomes a service point that housekeeping can reach and a guest can interfere with.

Ask for the input voltage range in writing. For hotel work we supply a built-in supply covering 100–240 V AC input, because mains voltage in many markets is not reliably 220 V and a narrow-range unit will fail on a low-voltage line. Also ask what happens at the end of the line: the driver should be constant-current with over-current and over-temperature protection, not a simple resistor module.

Decision 2: what does “waterproof” mean on the datasheet?

Bathroom mirrors are routinely described as IP44, IP65 or “waterproof”. Treat all three as unverified until you know what was tested.

The parts of a mirror that fail in a bathroom are the electrical parts. A mirror with an IP44-rated LED strip inside an aluminium housing, but with an open-back panel and a standard terminal block, is not IP44 — it is IP20 with a label.

What we specify for a hotel bathroom wall mirror:

• A resin-backed panel rather than MDF. MDF is a wood product; in a wet enclosure with a wash-down cleaning regime it will eventually swell behind the glass. This is the single most common failure we are asked to fix after the fact.
• A fully potted or sealed LED channel with silicone bonding, so there is no path for water to reach the strip or the joints.
• No IP rating on the whole mirror unless the whole mirror was tested. Ask what exactly was in the test chamber, and for the report number.
• Confirm the bathroom zone. Zone 2 (above a basin, outside the direct spray path) is a very different requirement from Zone 1 (over a bath or shower). Many hotel bathrooms are specified to a Zone 1 requirement unnecessarily; many are supplied to a Zone 2 requirement and then installed in Zone 1.

Decision 3: the glass coating — the detail that decides the service life

This is not visible on a sample and it is the thing that determines whether the mirror still looks good in year three.

There are two mirror coatings in general use. Silver (a pure silver layer) has the best reflection of the two, roughly 90%+, but it corrodes in humidity and develops black edge spotting. Eco-silver (silver with an aluminium layer and a protective overcoat) gives up about 3–5% of the reflectivity and is markedly more stable in humid conditions.

For hotel bathrooms, serviced apartments and any coastal project, we specify eco-silver without discussion. The reflection difference is not something a guest will notice; the edge spotting is something every room in the hotel will eventually show.

Also specify the glass thickness and whether it is bonded to the backing. A mirror with a 2 mm float glass loosely mounted will show a visible ripple under a raking light from a bathroom downlight, and it will drift in the frame over time.

Decision 4: how is it mounted, and who does the work?

Three mounting methods cover almost everything:

• French cleat / keyhole hanging. Two brackets and a screw or two. Standard for mirror weights up to about 15 kg. Needs a sound substrate — plasterboard on its own is not enough, and the installer needs to know that.
• Back plate with a keyhole slot. The mirror has a rigid aluminium back plate with a single keyhole slot and a safety clip. The installer sets the height on the plate and lowers the mirror into it. This is the most common method for large panels and the easiest to align on site.
• Adhesive or hook-and-loop fixing. Only for very light units, and only where screw fixing is impossible. We will supply it if asked, but we will not recommend it for a hotel.

Decide the installation responsibility before ordering. The mirror arrives with the fixings and a template, or it does not. In a project of any size the difference in installation time per unit is significant, and that cost lands on your contractor, not your supplier.

Decision 5: light output, colour and control

• Colour temperature. For hotel bathrooms, 3000 K is generally the safer choice — warm light flatters skin tones and reads as more luxurious in a vanity context. 4000 K suits a corridor or a back-of-house vanity. Specify a single temperature across the project unless the operator has asked for a scene setting.
• CRI. Specify CRI 90 or above for a vanity mirror. Below 90, the LED makes skin tones look flat and slightly green, and it is visible in the mirror every single day. This is a cheap specification to add and a very visible one.
• Dimming. A touch dimmer with three positions (typically 3000 K / 4000 K / 6000 K) is the most requested configuration for hotel bathroom mirrors. If you are supplying for a hotel, it is worth the cost.
• Control position. Where does the switch go? A touch sensor on the mirror face, a separate wall switch, or a hotel room control system? If the room control system takes over, the mirror needs to be specified as a dumb mirror with a two-wire feed, and the driver has to be dimmable by that system — tell the factory at order stage, not after the sample.

Decision 6: what happens at the end of the room's life

Almost nobody asks this, and it is where projects get expensive.

• Spare parts. Will the driver, the touch sensor and the LED strip be replaceable on site, or does a failed driver mean a whole new mirror? Specify the spare-parts list and the price at order stage. A hotel that cannot fix one mirror without a container of new ones has a problem.
• Replaceability of the mirror itself. If a mirror is damaged in service, can it be replaced with an identical unit three years later? That means the finish, the glass tint and the LED colour must be reproducible. Ask for a retained finish sample against the production batch — this is a normal request and a factory that keeps one is a factory that will still be there next time.
• Certification for the destination market. The mirror is an electrical product. The importer or the local operator is normally the party that holds the market approval; the factory can build to the standard and supply the test documentation, but the certificate itself is applied for by whoever is legally responsible in your market. Get this agreed in writing before production, because it determines which version of the product you order.

The specification, condensed

What we would put on a hotel bathroom mirror order, as a single line each:

• Shape and size: as per the room drawings, nominal 600 × 800 mm
• Frame: K9 crystal, polished, on an aluminium carrier
• Glass: 5 mm eco-silver coated mirror glass, resin-backed, sealed
• Lighting: 12 V LED strip, silicoled into a sealed channel, CRI 90+, 3000 K
• Control: 3-position touch dimmer on the mirror face
• Supply: built-in wide-voltage 100–240 V driver with over-current and over-temperature protection, hard-wired via a certified plug or 2-wire feed as required
• Mounting: aluminium back plate, keyhole slot plus safety clip; fixings and a 1:1 setting-out template included
• Protection: sealed LED channel and closed-back resin panel; suitable for bathroom Zone 2
• Spare parts: driver, touch sensor and LED strip available as spares against the batch number
• Finish sample: one retained sample per production batch for future replacement orders

What to send us so we can quote accurately

• Room drawings or a schedule of sizes, with the quantity per size
• The bathroom layout, or at least the zone each mirror sits in
• Whether the supply is hard-wired, plug-in or on a room control system
• Your target market, so we can quote the right certification route
• The delivery schedule and whether it is one phase or phased by floor
• Two photographs: one of the vanity in daylight, one of the wall where the mirror will sit

With those we can return a priced specification and a 1:1 drawing per size within a working day, plus a realistic statement of what will and will not pass in your destination market.