An LED in the wrong spot can ruin your day (and your bathroom)
Let’s be clear: lighting is the element that transforms a bathroom the most with the least investment. A bathroom with ordinary tiles but great lighting beats a bathroom with Carrara marble and a 1990s tube fluorescent stuck to the ceiling every single time. But the bathroom is, electrically speaking, the most dangerous room in the house. Water + electricity = a combination that demands respect.
And this is where IP ratings, electrical safety zones and REBT regulations come in — which most people ignore until the electrician tells them that no, that gorgeous wall sconce they bought can’t go where they want to put it.
At Bathscape we encounter this situation every week in renovations across Valencia: the client arrives with a clear idea of where they want the lights and a sack full of enthusiasm, and we have to explain that the electrical code has something to say about it. So let’s clear things up once and for all: what you can install, where, and why.
The IP rating system: the two numbers that tell you everything
IP stands for “Ingress Protection” (degree of protection against the entry of elements). It’s an international standard (IEC 60529) that uses two digits to classify an electrical device’s resistance against solids and liquids.
First digit: protection against solids (0-6)
| Digit | Protection |
|---|---|
| 0 | No protection |
| 1 | Objects > 50 mm (back of hand) |
| 2 | Objects > 12.5 mm (finger) |
| 3 | Objects > 2.5 mm (tools) |
| 4 | Objects > 1 mm (fine cables) |
| 5 | Partial dust protection |
| 6 | Completely dust-tight |
Second digit: protection against water (0-8)
| Digit | Protection |
|---|---|
| 0 | No protection |
| 1 | Vertical dripping |
| 2 | Dripping at 15° tilt |
| 3 | Water spray (rain) |
| 4 | Splashes from any direction |
| 5 | Low-pressure water jets |
| 6 | High-pressure water jets |
| 7 | Temporary immersion (30 min at 1 m) |
| 8 | Continuous immersion (per manufacturer) |
What the common bathroom ratings mean
- IP20: No water protection. Only for 100% dry zones (hallway outside the bathroom).
- IP44: Protected against splashes from any direction. The minimum for most of the bathroom.
- IP65: Protected against low-pressure water jets. Required near the shower and bathtub.
- IP67: Temporary immersion. For luminaires recessed into the shower floor or inside bathtubs.
- IP68: Permanent immersion. Pools, spas. Rare in residential bathrooms.
A detail that goes unnoticed: IP65 is not “better” than IP44 in everything. IP65 protects against jets but an IP65 product may have a 5 in solids (not completely dust-tight), while an IP44 has a 4 in solids. For the bathroom, the relevant number is the second digit (water), but don’t ignore the first.
The bathroom’s electrical zones according to the REBT
The Spanish Low Voltage Electrical Regulation (REBT), in its instruction ITC-BT-27, divides the bathroom into 4 zones with different electrical requirements. This is not a recommendation: it is law. An authorised installer who places a non-compliant luminaire in the bathroom faces penalties and, worse, civil liability if there’s an accident.
Zone 0: Interior of the bathtub or shower tray
The interior volume of the receptacle where water falls directly.
- Minimum IP: IP67
- Maximum voltage: SELV 12V (safety extra-low voltage)
- What you can install: Specific immersion LED luminaires (12V DC with transformer outside zone 0). In practice, very few clients install light in zone 0 — it’s more common in spas or whirlpool baths.
- What you CANNOT install: Nothing at 230V. No wall sconce, no conventional recessed spotlight. Nothing.
Zone 1: Above bathtub/shower up to 2.25 m height
The volume above the bathtub or shower tray, from the upper edge of the sanitary ware to 2.25 m height from the floor.
- Minimum IP: IP65 (IP44 only permitted for SELV 12V luminaires)
- Maximum voltage: SELV 12V recommended. 230V permitted with 30 mA residual current device.
- What you can install: IP65 recessed LED spotlights in the ceiling above the shower. IP65 or IP67 LED strips as indirect lighting. Showers with integrated LED (chromatic showerhead type).
- Practical example: A 7W recessed LED downlight, 3,000 K, IP65, above the shower. Cost: €15-30 per unit.
Zone 2: 60 cm around bathtub/shower
The volume extending 60 cm horizontally from the edge of the bathtub/shower (or from zone 1 if there is no screen) and up to 2.25 m height.
- Minimum IP: IP44
- Voltage: 230V permitted with 30 mA residual current device.
- What you can install: IP44 wall sconces, mirrors with integrated lighting, IP44 recessed spotlights. This is the most common zone for the bathroom’s main lighting.
- Practical example: LED wall sconce above the mirror, 12W, 4,000 K, IP44. Cost: €25-60.
Zone 3 (or outside zones): Rest of the bathroom
Everything outside zones 0, 1 and 2. In small bathrooms (less than 4 m²), practically the entire bathroom is zone 1 or 2. Only in large bathrooms is there a significant zone 3.
- Minimum IP: IP20 (theoretically), but we recommend IP44 as a minimum anywhere in the bathroom. Ambient humidity (70-95% RH during showering) affects unsealed luminaires even if water doesn’t fall on them directly.
- What you can install: Any luminaire with minimum IP44 protection. Ceiling lights, flush mounts, tracks.
To visualise these zones in your bathroom, you can use our 3D configurator where we automatically mark the electrical zones when you position the shower and bathtub.
Types of LED luminaires for the bathroom
Recessed downlights (ceiling spotlights)
The cleanest and most versatile solution. They recess into the false ceiling (you need a minimum 7-10 cm gap) and provide uniform general light.
- Typical wattage: 5-9W per spotlight
- Lumens: 400-700 lm per spotlight
- Diameter: 7-12 cm (recessing hole)
- Available IPs: IP44, IP65 (look for the correct version for each zone)
- Cost: €8-35 per unit depending on quality and brand
- Recommended quantity: 1 spotlight per 1-1.5 m² of bathroom. A 5 m² bathroom needs 4-5 downlights.
- Colour temperature: 4,000 K (neutral) for general lighting. It’s the sweet spot that works for everything.
Wall sconces (mirror lighting)
Mirror lighting is the most important in the bathroom from a functional standpoint. It’s where you apply makeup, shave, check your teeth. If you could only invest in one luminaire, invest in this one.
- Ideal position: On both sides of the mirror (not above). Side lighting eliminates facial shadows. Overhead lighting creates shadows under the eyes, nose and chin that make makeup difficult.
- Wattage: 8-15W per sconce (16-30W total)
- Minimum CRI: 90. This matters. CRI (Colour Rendering Index) measures how faithfully a light reproduces real colours. A CRI of 80 (common in cheap LEDs) distorts skin tones. A CRI of 90+ shows colours as they are. For makeup and personal care, it’s non-negotiable.
- Colour temperature: 4,000 K (neutral) or adjustable 2,700-5,000 K if you want to adapt the light to each activity.
- Minimum IP: IP44 (typical zone 2).
- Cost: €30-80 per quality sconce with CRI > 90.
LED strips (indirect and accent lighting)
LED strips are the most versatile tool for creating ambience. Under the vanity, behind the mirror, around the ceiling perimeter, in shower niches.
- Wattage: 4.8 W/m (decorative) to 14.4 W/m (functional lighting)
- Lumens: 300-1,200 lm/m depending on wattage
- Width: 8-12 mm
- Voltage: 12V DC or 24V DC (transformer outside the wet zone)
- Strip IP rating:
- IP20: No protection. Only outside wet zones (behind a mirror in zone 3).
- IP44: Resin-coated on top. For zone 2.
- IP65: Full silicone sleeve. For zone 1 (above the shower).
- IP67/IP68: Sealed silicone tube. For niches inside the shower.
- Adhesive: Strips with 3M VHB adhesive hold well on clean surfaces. For wet zones, reinforce with clip-on aluminium profile.
- Cost: €5-15/m (strip) + €15-30 (transformer) + €10-25 (aluminium profile/m).
Important: LED strips need an aluminium profile. Sticking the strip directly to the tile is tempting but bad: the aluminium acts as a heat sink (LEDs generate heat that degrades lifespan), hides individual LED dots (diffuser) and gives a professional vs amateur finish.
Backlit mirror
A mirror with integrated perimeter LED lighting. The light comes from behind the mirror creating a uniform halo that illuminates the face without glare.
- Advantage: Combines mirror + functional lighting in one piece. Clean finish. Many models include a demister, touch sensor and brightness control.
- Wattage: 15-30W integrated
- CRI: 80-95 depending on model (always ask for > 90)
- IP: IP44 (most go in zone 2)
- Cost: €80-350 depending on size and features
- Our recommendation: If your budget allows, the backlit mirror replaces the wall sconce and looks infinitely cleaner. In our projects you’ll see how we integrate it.
Colour temperature: the science behind the sensation
Colour temperature is measured in Kelvin (K) and determines whether light is perceived as warm (yellowish) or cool (bluish).
| Kelvin | Sensation | Use in the bathroom |
|---|---|---|
| 2,700 K | Warm (yellow) | Relaxing bath, nighttime ambient lighting |
| 3,000 K | Warm neutral | Pleasant general lighting |
| 4,000 K | Neutral (white) | Mirror lighting, makeup, shaving |
| 5,000 K | Cool (bluish) | Maximum visibility, reproduces midday natural light |
| 6,500 K | Very cool | Operating theatre. Not recommended for a residential bathroom. |
Our recommendation at Bathscape: 4,000 K for main and mirror lighting. 2,700 K for ambient and nighttime lighting. If you can, install luminaires with adjustable temperature (tunable white) and select 4,000 K in the morning and 2,700 K at night. It’s an everyday luxury that costs only €5-10 more per luminaire.
If you’re also interested in automating the lighting, in our article on automatic lighting for safety we explain how to programme scenes by time of day.
Lumen calculation: how much light your bathroom needs
The European standard EN 12464-1 doesn’t directly apply to residential bathrooms (it’s for workspaces), but it serves as a reference. For a residential bathroom, we recommend:
- General lighting: 200-300 lux across the entire surface
- Mirror lighting: 400-500 lux on the face plane
- Ambient lighting: 50-100 lux (optional, to create atmosphere)
How to calculate
Lux = Lumens / m². Therefore: Lumens needed = Desired lux x m².
Example: 6 m² bathroom, general lighting at 250 lux.
- Lumens needed: 250 x 6 = 1,500 lm
- With 600 lm downlights: 1,500 / 600 = 2.5 → 3 downlights
- With 450 lm downlights: 1,500 / 450 = 3.3 → 4 downlights
Plus the mirror: 2 sconces of 800 lm each provide 1,600 lm concentrated in 0.5-1 m² of the sink area = 1,600-3,200 lux in that zone. More than enough.
Use our calculator to estimate the lumens your bathroom needs based on its dimensions.
Consumption comparison: LED vs halogen vs fluorescent
| Parameter | LED | Halogen | Compact fluorescent |
|---|---|---|---|
| Efficiency | 100-150 lm/W | 15-25 lm/W | 50-70 lm/W |
| Lifespan | 25,000-50,000 h | 2,000-4,000 h | 8,000-15,000 h |
| Consumption (800 lm equivalent) | 6-8 W | 42 W | 13 W |
| Annual cost (3 h/day, €0.18/kWh) | €1.18-1.58 | €8.27 | €2.56 |
| Turn-on time | Instant | Instant | 30-60 s to full brightness |
| Typical CRI | 80-98 | 100 (reference) | 80-85 |
| Heat generated | Low | High (very high in enclosed space) | Medium |
| Dimmable | Yes (dimmable models) | Yes | Limited |
Halogen has a perfect CRI (100), which was its great advantage for mirror lighting. But LEDs with CRI 95+ are now available for €5-10 more than standard ones, without halogen’s brutal consumption. There’s no debate: LED wins in every relevant category for a modern bathroom.
Concrete savings data: Replacing 5 x 50W halogen GU10 spotlights with 7W LED GU10s in a bathroom with 2 hours of daily use saves €54.70 per year (at Spain’s 2026 average electricity price: €0.174/kWh). The investment in 5 LEDs (€25-50) is recovered in the first year.
Installation costs in the Valencian Community
| Work | Approximate cost |
|---|---|
| Installation of 4-5 recessed downlights (including wiring from consumer unit) | €200-350 |
| 2 wall sconces on either side of the mirror | €80-150 (labour) + sconce cost |
| Under-vanity LED strip with aluminium profile (1.5 m) | €60-100 (materials + installation) |
| Backlit mirror (electrical connection) | €50-80 (connection only, mirror separate) |
| IP67 LED strip in shower niche with transformer | €80-140 |
| New light point (from consumer unit, with chasing and wiring) | €120-200 per point |
These are labour prices from authorised electricians in Valencia, Castellon and Alicante. Materials are additional. If the renovation includes other work, lighting is integrated into the overall budget with economies of scale. At Bathscape, lighting design is included in all our renovations. Check how our process works.
Lighting mistakes we see constantly
-
A single light point centred on the ceiling: Creates shadows in every direction. You need a minimum of 3 points: general lighting (ceiling), mirror lighting (wall) and ambient lighting (optional).
-
Low CRI LED for the mirror: A CRI of 80 makes your skin look greyish and makeup colours appear distorted. In the shop everything looks fine because commercial lighting has CRI 90+. Then you get home and the lipstick that was raspberry looks brown. Solution: CRI > 90 for mirror light, always.
-
Putting IP44 inside the shower: This is the most dangerous regulatory error. IP44 resists splashes, not direct jets. Inside the shower (zone 1) you need IP65 as a minimum. We’ve seen IP44 spotlights inside shower enclosures that start failing at 6 months due to water ingress.
-
Ignoring the LED strip transformer: The transformer (driver) cannot go inside zone 0 or zone 1. It must be mounted outside, in zone 2 or 3, and from there run the 12V/24V cable to the strip. The low-voltage cable can enter zone 1.
-
6,500 K colour temperature “because it’s brighter”: It’s the same in lumens, but the sensation is of a doctor’s surgery. A bathroom at 6,500 K is uncomfortable, cold and unwelcoming. Save it for the garage workshop.
If you’re planning your renovation, visit our BathBuilder to configure your bathroom lighting and see how it looks visually. And don’t hesitate to check the client reviews from those who have already trusted our lighting design.
Frequently asked questions
Can I put an LED strip inside the shower tray (on the floor)?
Technically yes, with IP68 and SELV 12V DC supply. But in practice it’s a nest of problems: soap and limescale buildup on the strip, maintenance difficulty and risk of mechanical damage from stepping on it. We don’t recommend it. If you want to light the shower floor, use an IP67 strip in the niche or flush with the wall, not on the floor.
Do dimmable LEDs need a special driver?
Yes. LEDs are only dimmable if the driver (transformer) is dimmer-compatible. If you use a conventional (phase-cut) dimmer with a non-compatible driver, the light flickers, buzzes or doesn’t dim correctly. Always check that the driver is “dimmable” and compatible with the type of dimmer you’re using (TRIAC, 0-10V or PWM).
How long do LEDs actually last in a bathroom?
Manufacturers indicate 25,000-50,000 hours, but that’s under ideal conditions of temperature (25 °C) and ventilation. In a bathroom, with ambient temperature of 30-35 °C during showering and 80-95% humidity, lifespan is reduced by 15-30%. Even so, a 25,000 h LED at 2 h/day lasts 24 years with the reduction. Don’t worry about lifespan; worry about choosing the right IP and CRI.
Can I install the luminaires myself?
Electrical installation in wet rooms must be carried out by an authorised electrical installer (basic category or above) according to the REBT. You can change an LED bulb for another in an existing lamp holder, but installing new light points, running cables or connecting transformers is professional work. Not only for safety, but because without an authorised installer’s electrical certificate, your home insurance doesn’t cover electrical incidents.
Is it worth investing in smart lighting (Smart LED)?
If you’re already renovating the bathroom, absolutely. The price difference between a conventional LED downlight (€10) and a smart Zigbee one (€20-30) is minimal. And the ability to adjust brightness, colour temperature and automate activation via presence sensor transforms the daily experience. Check our guide on IoT ecosystems in the bathroom to see how to integrate lighting into a complete home automation system.
What regulation applies in Spain for bathroom lighting?
The main regulation is the REBT (Low Voltage Electrical Regulation), specifically instruction ITC-BT-27 which defines protection zones in rooms with a bathtub or shower. Additionally, the UNE-EN 60598 standard establishes the safety requirements for luminaires and the IP classification. Every authorised installer must know and comply with both regulations.
