A burglar wants to stay unnoticed. They avoid lit areas, neighbours who might be watching, anything that increases the risk of being seen or identified. Darkness works in their favour: it hides the approach, the time spent near a door or window, and the getaway.
What the gendarmerie recommends
The French National Gendarmerie's burglary prevention advice page lists several pieces of equipment to install at home: shutters, grilles, alarms, but also timed lighting and presence detectors, listed side by side among the recommended measures. A floodlight that switches on when someone passes falls into this category: it does not replace a solid door or an open sensor, but it is one of the devices the authorities recommend adding to a home, not just a comfort gadget.
A timed light and a light that reacts are not the same thing
Leaving a light on all night, or even on a timer that switches it on at a fixed time, offers limited protection: a light that stays constant ends up blending into the background, and a burglar who watches a house over several days quickly spots the pattern. A motion detector changes the nature of the signal: the light only comes on if something moves nearby. For someone approaching a driveway or garage in the dark, that sudden trigger has an immediate effect: it shows that a sensor has reacted to their presence, without them knowing whether someone else was alerted at the same moment.
What this effect does not allow us to claim
No French study measures the deterrent effect of outdoor lighting in isolation, separately from the other security measures installed at the same time in the households studied. It would therefore be inaccurate to put a precise figure on the number of burglaries prevented by a motion-sensor floodlight. What is established, however, is that the authorities recommend it as one part of a coherent whole, not as a solution that works on its own against a poorly locked door or a window left open.
The locations that matter most
The path leading to the front door, the garage entrance, and the corners of the garden that stay in shadow after dark are the areas where a motion detector makes the most sense: they are the unavoidable routes for anyone approaching the house. A floodlight aimed at these passages covers the essentials, without lighting the whole plot or adding more light points.
Adding an image, not just a reaction
A floodlight that switches on signals a detected presence, but does not say who passed by or why. Combined with an outdoor camera, it provides a second level of information: the light changes the behaviour of the person spotted in the moment, while the camera keeps a record of what happened. The two devices play different roles and complement each other rather than replace each other.
The practical case for solar power
A solar floodlight avoids running an electrical cable and calling in an electrician: it is fixed in place and works as soon as the panel has stored enough light during the day, with autonomy that naturally drops in winter when the days are short. This autonomy matters especially for areas far from the fuse box, such as the bottom of a garden or a detached garage, where a standard connection would require work out of proportion to the use.
The matching product
SentinHome's solar motion sensor floodlight covers these uses: wire-free mounting, adjustable brightness, and an IP44 rating that protects it from splashing water; fitting it under eaves shields it from heavy rain. See our full selection on the home security page.
Further reading
Outdoor motion alarm: what it adds before the camera and Operation Tranquillité Vacances: what the French police do and don't do round out this approach to outdoor security.