
I can measure lumens within 5%. I recently ordered a Nite IZ 74 lumen bulb and installed it in a vintage flashlight. I measured 60 lumens in front of the flashlight. Near enough. The manufacturer specification is usually measured at the output of the LED itself. Normally the front lens of a flashlight emits a little less light due to reflector inefficiency etc. Thought I'd get a little brighter with FALANFA (rated 180 lumens). FALANFA should be at least twice as bright as Nite IZ. When I finally installed the LED bulb, I was surprised at how weak it was (I measured 20 lumens). It's either buggy or some kind of false advertising. I made sure the bulb said "3V" on the side (to make sure I got the correct voltage LED bulb).

Lamp LED Xiaomi Mi Smart LED Bulb Warm White (XMBGDP01YLK), E27, 8 W, 2700 K
26 Review

Smart socket Yandex with Alice, black
30 Review

Royal Canin Gastrointestinal Low Fat Dry diet food for adult dogs with digestive disorders, 12 kg
23 Review

Lamp LED Xiaomi Mi Smart LED Bulb Essential (MJDPL01YL), E27, 9 W, 6500 K
113 Review

🔌 Enhance Your Electrical Work with Klein Tools 69411 Accessory Adapters
7 Review

🔌 Bussmann GMA 5A Acting Cartridge Listed: Reliable and Efficient Cartridge Fuse for Your Automotive Needs
7 Review

⚡ 20 Amp Single Circuit Breaker for Q120
8 Review

125V Industrial Electrical Fast Blow Glass Fuses - SIXQJZML Enhanced SEO
9 Review