Having tested both flashlights, I can tell you that there's not a huge difference in the perceivedlight output between the TK12 and TK15.
有测试两手电筒，我可以告诉你，没有大不一样的光输出所tk12和TK15之间。
2
The lightperceived by the human eye is measured in units called lumen-hours.This is about the amount produced by burning a candle for an hour.
人眼能感知的光亮是以流明-小时为单位计量的，每流明相当于一支燃烧一小时的蜡烛产生的能量。
3
This is “the light of the knowledge of the glory of God” (2 Corinthians 4:6), and it is as immediately perceived by the Spirit-awakened heart as light is perceived by the open eye.