I saw many introduction on 3-5W led flashlight, declare their ones could reach 24000LM, according to current led light efficiency 120-150LM, which at least 160Watts, so how it can be ? If it is lighting intensity 24000Lux, i believe, but luminous flux... very worry about the introduction.
How a flashlight could reach 24000Lm?
- Thread starter superled
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RetroTechie
Flashlight Enthusiast
Welcome here, superled! :wave:
Simple answer is you can't (get around the laws of physics). Currently the best available commercial white LEDs output close to 200 lm/W. But a more realistic number (especially if you take other losses into account) is ~100...120 lm/W for a good flashlight.
Meaning 3-5W can get you ~400...600 lm tops, maybe a bit more if state-of-the-art LEDs are used & little energy is wasted elsewhere. And for 24k lm you need in the order of 200W. Well above 100W in any case, even if you would use such ~200 lm/W LEDs & have few losses elsewhere.
If some advertising claims otherwise they're lying. Which is usually a good indicator they're selling junk... :laughing:
In short: don't bother to 'ask the internet' to judge such claims. Decide whether they could be true using your pocket calculator.
Simple answer is you can't (get around the laws of physics). Currently the best available commercial white LEDs output close to 200 lm/W. But a more realistic number (especially if you take other losses into account) is ~100...120 lm/W for a good flashlight.
Meaning 3-5W can get you ~400...600 lm tops, maybe a bit more if state-of-the-art LEDs are used & little energy is wasted elsewhere. And for 24k lm you need in the order of 200W. Well above 100W in any case, even if you would use such ~200 lm/W LEDs & have few losses elsewhere.
If some advertising claims otherwise they're lying. Which is usually a good indicator they're selling junk... :laughing:
In short: don't bother to 'ask the internet' to judge such claims. Decide whether they could be true using your pocket calculator.
