23 is by far the best for lighting up pathways. Design is simple and robust, easily removed for portability, no reflective cover, no direct eye-contact with LED, wide-angle detection range(about 160 degrees), and has an active sensor (meaning it won't leave you in darkness until you're out of range and will only shut off 30 seconds thereafter). Although rated for 1.5V, Eneloop rechargeable batteries (1.2V) works just fine.

Caution - other reviewers had bad experience with the included double-sided adhesive; it is definitely of cheap quality and will almost certainly damage your wall when removed. This nightlight requiring 4xAA batteries needs stronger adhesive. I guessed that is why mounting screws are included. If you hate making holes in wall like myself, strongly suggest using 3M damage-free adhesive which I've been happily using and removing without pain.

Note: This is not meant for above eye-level placement because its LED will blind you!

Conclusion - For its purpose, this nightlight is a great design. Not meant to compare with overhead or directional models. Hence, I've rated this 5 stars. I'm usually skeptical about purchasing lights online especially when lumens ratings are not given. I took the risk even though some reviewers complained about it being not bright enough. Comparing this with my dozens of nightlight, it is brighter than all of them (both battery and electrical operated). All 3 works out-of-the-box as advertised and having read pro-active comments from the manufacturer for those 1-star reviews, I was not worried about DOA anyway. Glad I bought this and hope this review helps!

Update as of Oct 20, 2015 - It's coming 4 years and mine are still working great. No degradation on sensitivity of motion sensor or light brightness.

这款灯是迄今为止最好的照明灯。设计简单，坚固，便于携带，没有反射罩，没有直接与LED的眼睛接触，广角检测范围（约160度），并有一个主动传感器（意味着它不会让你处于黑暗中，当你超出特定范围，还将延迟30秒才自动关闭），额定电压为1.5V，如果能使用eneloop充电电池（1.2V）的就好了。
注意：

其他点评者对产品上的双面胶有不好的感受，这些双面胶便宜，质量不怎么好，而且肯定会损坏你家的墙壁。由于这款灯使用了4节aa电池，所以需要更强的粘合剂。我猜这就是为什么需要使用螺丝来安装。如果你像我一样讨厌在墙上打洞，强烈建议使用3M无损伤的胶粘剂，我一直是这样使用的。

注意：这并不意味着在上面的眼睛位置放置，因为它的LED会使你失明！
结论：

这款灯是一个伟大的设计。因此，我给5颗星。我通常对网上购买的灯持怀疑态度，尤其是在不给予流明评级的情况下。尽管有些用户抱怨它不够明亮，但我还是冒了这个险。与我的几十个小夜灯比较，它比所有这些更亮（电池和电动）。我很高兴买了这个，希望这个点评对你有帮助！
2015年10月20日更新：使用了它4年，其运动传感器灵敏度和亮度并没有降低。

llenge rather than a solution. The brightness & intensity of the LED, combined with the downward direction, will essentially BLIND your pet since their eye-level is 'super-mega-low' to the ground. Whereas humans shouldn't encounter this problem unless you're crawling up the stairs...which I, personally try to avoid.

I've come up with what I feel is an adequate solution which caters to humans, and our lovable creatures. Get some tape and a sharpie or whatever you have on-hand. I played around with different materials and colors until I found a good light filter or translucency I liked best, including: yellow and orange ribbon, clear scotch tape colored with highlighters, sharpies, markers etc...I tried brown box/shipping tape, which was a bit too deep of an amber for my preference, white(out) tape colored with a light-orange sharpie and that was the winner!! Just stick that sucker over the LED and possibly an extra piece of clear tape for security, and TA DAA!! I realize it's difficult to photograph bright LED's but I've tried in the same lighting in hopes to at least provide a comparison of the difference.

Aside from my little LED dimming experiment for our needs, these really are great lights. 5 stars because they don't claim to be, "PET STAIR LIGHTS." The functionality, consistency, and mounting options are great. I haven't actually tried the adhesive strips but I saw a couple review-pics where it looked to have damaged their walls. I'm in a rental so I'll likely use command tape just to play it safe.

the wall so this light comes on before you get to the top of the stairs.

They use a single LED light that is plenty bright enough that we can see the stairs with just these motion light, especially in the middle of the night.

The batteries last about 6 month with us using these as our primary lights going up the stairs until we get to our bedroom

NOTE: These light will turn on in 2 situations where there is no one there..

** During the winter and summer they will sometimes come on when the heater or AC first kicks in during the middle of the night.
The difference in room temperature and the temperature from the first blast of heat or cold air is sometimes enough to trigger the sensor.
This scared the cr@p out of my wife (and me as she woke me in a panic) the first time this happened thinking there was someone down stars, since we can see stairs from our bedroom door as the lights turn on and off..

** When the batteries are low the light will turn on as normal then turn off and turn back on a second later, repeating until you replace the battery. My wife once again woke me in a panic because the heat or air was not on.

I hope my review help.