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The Philips Hue motion sensor is the absolute reference in motion sensors. It is therefore likely that you already have one at home. However, you may not know that this accessory also measures light levels and that its readings are available in HomeKit. This allows this already great sensor to work with automatisms, allowing you to activate things like your blinds when it's a bit too dark.
$ 40 at Amazon
The iHome 5-in-1 Smart Monitor is a solution of choice, providing motion, sound, temperature, moisture and light sensors in one compact frame. This sensor measures the amount of light flux in its environment and sends this data to the Home application, paving the way for automation. An in-camera display also makes its information available at a glance, which is perfect for times when your iPhone is not available.
$ 30 at Amazon
The Fibaro motion sensor has a unique eyeball design, which is only suitable to the extent that it can detect movements and brightness levels. This sensor can also measure the temperature and even has an accelerometer that warns you if it detects any alteration. If that was not enough, this eye within everyone's reach is also completely wireless, running on a single CR123A battery.
$ 70 at Walmart
As its name indicates, the Terncy Awareness Switch switches to monitor your environment with motion detection, temperature, and lighting levels. This multi-sensor also has a convenient button in its center, making it one of the most performing accessories on the market. In addition to HomeKit support, Awareness Switch also works with Alexa from Amazon and Google Assistant, covering all the basics.
$ 36 at Amazon
Do not be fooled by its looks, the Aqara motion sensor is a small compact accessory, which must be seen in person. Despite its small size, this tiny device also manages to capture light detection capabilities, allowing placement out of sight. Best of all, this sensor is sold with a small price, making it the cheapest option.
$ 20 on Amazon
The Philips Hue outdoor motion sensor combines the already fantastic motion sensor already present with certified weather resistance. This outdoor sensor can withstand heavy rains and extreme temperatures, covering your home all year round. The twilight detection capabilities at dawn allow for real automations at sunset and sunrise, relying on the actual lighting levels outside your home and not from a generalized location.
$ 50 at Amazon