Published on 10/19/2026 · by Leandro Caldas, glazier, founder of Routeck and creator of the Arena
LED mirror touch sensor: the R$ 2,000 kit from the Arena finale
In the Season 1 finale of Arena do Vidro, the score ended 29.37 to 27.12. Janael took home the 10,000 reais. But I wasn't going to let Rômulo leave empty-handed: the runner-up got a consolation prize, almost a Christmas basket, a gift from LED Glass. A R$ 2,000 kit of supplies, with rubber edge trim, frames and touch switches, the same things the contestants used in the Arena. The LED mirror touch sensor was in there, and that's what I want to talk about here.
The kit was heavy, lots of stuff in it. And Rômulo answered right away, with the line that stuck with me most from the episode: "With this two thousand in prizes, I'll make 10 thousand." That's a glazier's mindset. Supplies aren't money sitting on a shelf, they're mirrors sold. So let's get to what matters: how to make good use of that material, starting with the touch sensor.
What the touch sensor does on an LED mirror
The touch sensor is stuck to the back of the mirror and turns the LED strip on and off when someone touches the glass with a finger. No wall switch, no button sticking out, no wires showing. For the end customer, that's what makes the mirror look store-bought. Depending on the model, the same touch also dims the light (hold your finger on it) or switches the white between cool, neutral and warm.
It runs on low voltage: it sits between the power supply and the LED strip. The power supply takes power from the outlet and delivers the strip's voltage, and the sensor cuts or passes that power. That's why the sensor has to match the strip's voltage and handle the current it draws. A strip that's too long on a weak sensor is a warranty claim waiting to happen.
How to install the touch sensor without headaches
- Mark the touch spot in the design, before sandblasting. The area in front of the sensor is usually de-silvered or sandblasted with an icon, so the light shows through and the customer knows where to touch.
- Clean the back of the mirror well before sticking the sensor. Grease and sandblasting dust kill adhesion and the sensor comes loose over time.
- Stick the sensor flush against the glass, no bubbles and no gap. A sensor that sits away from the glass responds poorly or not at all.
- Respect polarity when wiring: power supply, sensor and strip, every wire in its place, following the manufacturer's diagram.
- Keep the sensor away from screws, brackets and metal parts, which can interfere with reading the touch.
- Test everything powered on before closing the frame. Once it's closed, redoing it costs you.
Mirror thickness matters too. Every sensor has a maximum glass thickness it can read a touch through, and the manufacturer tells you what it is. Check it before assembly, especially if the job uses thicker mirror.
Rubber trim and frames: the finish the customer sees
The other items in the kit are what make it look like a finished product. Rubber edge trim wraps the mirror edge, protects the polished edge from knocks and hides small cutting flaws. The frame holds the mirror, hides the strip, the power supply and the wires, and sets the style of the piece. On an LED mirror the light comes through the sandblasted band or from behind, and what the customer touches and looks at up close is the edge, the frame and the switch. If any of those three is sloppy, the whole mirror looks cheap.
| Kit item | What it does | Common mistake |
|---|---|---|
| Touch sensor | turns on, off and, on some models, dims the light with a touch on the glass | sensor badly stuck or too weak for the strip |
| Rubber trim | finish and edge protection | crooked joints left in plain sight |
| Frame | hides strip, power supply and wires and sets the style | closing it before testing the LED |
How to turn 2 thousand into 10 thousand, Rômulo's way
I'm not going to make up Rômulo's math, because he didn't share the numbers. But the reasoning is right, and any glass shop can do the same. Take the supplies you have and break them down per piece: how much trim, how many sensors, how many frames go into each mirror. Add the mirror, the LED, the power supply and your time. That's the cost of each LED mirror. The selling price comes from the value the customer sees, and the finish is exactly what pushes that value up.
A mirror with a touch sensor, a clean edge and a neat frame doesn't compete on price with a plain mirror. It sells as a decor piece. That's where two thousand in well-used supplies turns into a lot more in sales. And that's what Rômulo saw up on stage, worn out, right after losing the finale by just over two points.
- What was the consolation prize in the Arena do Vidro finale?
- A R$ 2,000 kit of LED Glass supplies, with rubber trim, frames and touch switches, given to Rômulo, the runner-up. Champion Janael took home the 10,000 reais.
- Does a touch sensor work on any LED mirror?
- It works when it matches the strip's voltage and current and when the mirror thickness is within what the sensor manufacturer specifies. Check both before assembly.
- Where does the touch sensor go on the mirror?
- Stuck to the back of the mirror. In front of it, the area is usually de-silvered or sandblasted with an icon, so the customer knows where to touch.
The full finale is at the top of this post, with the kit handoff and Rômulo's line. If you work with LED mirrors and want to sandblast the light band and the switch icon without making a mess in your shop, take a look at the Jateck at the link below, and hit me up on WhatsApp and I'll walk you through it.
Full Episode 4: the finale · Rômulo Sullivan of Monte Glass · Jateck