Effective as an alarm, but not so good as a light
The bulb is not very bright and doesn't have a very wide beam angle, it's also a very unsatifyingly cool colour temperature.
However, the reason I bought this is because the rubbish fridge in my rented house doesn't close properly half the time and we've lost so much food as a result.
For alerting me to an open/ajar door, it does a great job.
The timers for flashing light (10 secs) and alarm (20 secs) are too short and should be 30 secs and 1 minute in my opinion.
Verified purchase: YesCondition: New