Can you still see through it during the day?
The Most Important Question – and Why It Deserves an Honest Answer
A retailer who wants to display digital content in their shop window in the evening has only one concern during the day: Can you still see through it? A hotel asks the same question about its lobby glazing, a car dealership about its showroom.
The short answer is: Yes – when switched on, the film is transparent, and the view through the pane remains. The honest answer is a little more nuanced, and that is precisely what this article aims to provide.
What "transparent" measurably means
Two characteristic values describe the optical quality of a switched film:
Light transmission indicates how much light passes through the pane, including the film. For context: An uncoated single glazing is around 90 percent, typical insulating glass is 70 to 80 percent. High-quality PDLC films reach the high 90-percent range in their transparent state – so only a few percentage points are lost from the glazing's value. The glass structure installed makes a much greater difference than the film itself. Your local partner can tell you which values apply to your glazing.
The haze value describes how much residual light is diffusely scattered. It is the most honest metric: a low single-digit haze value means that the pane appears clear under normal viewing; only upon very close inspection – for example, against the light or in direct comparison with a bare pane – might a hint of silkiness be noticeable.
What passers-by actually perceive
Measurements are one thing, everyday perception another. Practical experience from installations shows that customers who are not aware that a film has been installed generally do not notice it.
There are two reasons for this. Firstly, no one compares a pane with its filmed state as they pass by – the reference point is missing. Secondly, the view through a shop window is already shaped by reflections, solar control glazing, and interior lighting; the film is lost in these normal optical properties of a glass facade.
Where the highest demands apply – for example, in luxury boutiques with elaborate product presentations – sampling is recommended: a test area on your own pane, assessed in morning, midday, and evening light.
The View from Inside
Often overlooked, but crucial for employees: The view from the inside out also remains. Offices retain their daylight and their view, sales staff see the street, guests in restaurants see their surroundings.
This distinguishes switchable projection film from permanent window graphics or perforated films, which shape sightlines and light incidence for their entire service life.
How the Technologies Differ
Besides projection on glass, there are other ways to use a pane digitally. They are not better or worse, but built for different tasks – much like headphones and loudspeakers both play music but are made for different situations.
Transparent LED film generates its own light and is therefore clearly visible even in daylight and over long operating hours. The LED and conductor structures remain permanently on the pane and can be noticeable depending on the product and viewing distance. Where digital content is meant to run all day, it is often the right choice.
Classic LED walls behind the pane are the brightest option and suit long viewing distances and brightly lit surroundings. They occupy the surface permanently and turn the shop window into a screen – which is intended wherever maximum visibility is the goal.
Switchable projection film focuses on dual use: a transparent glass surface during the day, full-surface projection in the evening. It is designed for lighting conditions from dusk onwards.
Which technology suits a location depends on operating hours, ambient light, surface size and viewing distance. You will find a detailed comparison in LED film or projection on glass – which fits better?.
| Projection film | Transparent LED film | LED wall behind glass | |
|---|---|---|---|
| Daytime view | Transparent, film barely noticeable in everyday use | Partly see-through, grid visible depending on product | Surface permanently occupied |
| Image effect | Full-surface and brilliant from dusk | Very bright, even in daylight | Very bright, even in daylight |
| Typical use | Large glass surfaces used in the evening and at night | Long operating hours, including daytime | Maximum visibility at a distance |
Conclusion
The concern is understandable – and it can be dispelled: In daytime mode, projection glass remains transparent, measurably close to normal glazing and practically indistinguishable from it in everyday life. The surface only becomes a screen when it is intended to be.
The most convincing answer to this question is your own view through the pane. A trained Lumerax partner in your region will show you sample surfaces, assess your glazing on site and tell you which solution suits your location.