Buy Premium Water Resistant Portable LED Lantern Flashlight

Buy Premium Water Resistant Portable LED Lantern Flashlight

Buy Premium Water Resistant Portable LED Lantern Flashlight

Finding a portable led lantern? Then buy this premium water-resistant portable led lantern flashlight have an extra-bright 60-lumen light powered by 30 high-powered led bulbs..
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%26nbsp%3B%0D%0A%0D%0AANSI%2FNEMA%20FL%201-2009%20Standard%0D%0A%0D%0ADetails%20about%20the%20FL1%20Standard%0D%0ACommonly%20abbreviated%20as%20the%20ANSI%20FL1%20Standard%2C%20the%20ANSI%2FNEMA%20FL%201-2009%20Standard%20is%20a%20set%20of%20flashlight%20performance%20guidelines.%20Before%20the%20introduction%20of%20these%20standards%2C%20you%20may%20have%20seen%20a%20variety%20of%20phrases%20on%20flashlight%20packaging%2C%20such%20as%20these%3A%0D%0A%0D%0A%26ldquo%3B3W%20LED%26rdquo%3B%20was%20a%20common%20term%20used%20when%20high-performance%20LEDs%2C%20such%20as%20the%20Luxeon%2C%20were%20first%20introduced.%20LEDs%20have%20varying%20efficiencies%20and%20rarely%20operate%20at%20the%20rated%20power%2C%20so%20this%20doesn%26rsquo%3Bt%20really%20have%20any%20meaning.%0D%0A%26ldquo%3B1%20million%20candlepower%26rdquo%3B%20(or%20any%20other%20multiple%20of%20a%20million)%2C%20is%20often%20seen%20on%20lanterns%20and%20spotlights.%20A%20million%20of%20anything%20is%20impressive%2C%20but%20how%20bright%20is%20one%20million%20candles%3F%0D%0A%26ldquo%3BHigh-flux%20LED%26rdquo%3B%20is%20really%20just%20a%20fancy%20way%20to%20say%20that%20the%20LED%20is%20bright%2C%20but%20even%20if%20you%26rsquo%3Bre%20an%20engineer%2C%20it%20still%20doesn%26rsquo%3Bt%20have%20much%20meaning%20to%20it.%0D%0A%0D%0A%0D%0A%0D%0A%0D%0A%0D%0AInterpreting%20the%20FL1%20Standard%0D%0A%0D%0ANow%20that%20we%20have%20defined%20these%20ratings%2C%20let%26rsquo%3Bs%20see%20what%20the%20not-so-obvious%20ratings%20mean%0D%0ALight%20Output%20vs.%20Peak%20Beam%20Intensity%26nbsp%3BAlthough%20higher%20output%20seems%20like%20it%20should%20correspond%20to%20higher%20intensity%2C%20a%20light%20with%20more%20lumens%20is%20not%20necessarily%20%26ldquo%3Bbrighter.%26rdquo%3B%20Here%26rsquo%3Bs%20why%3A%0D%0A%0D%0ALight%20output%20is%20determined%20by%20the%20total%20amount%20of%20light%20coming%20out-the-front%20(OTF)%20of%20the%20flashlight%20and%20is%20related%20to%20the%20LED%26rsquo%3Bs%20efficiency%20and%20how%20much%20power%20it%20uses.%0D%0APeak%20beam%20intensity%20represents%20brightness%20as%20perceived%20by%20the%20human%20eye%20and%20is%20related%20to%20how%20the%20beam%20is%20focused%20by%20the%20optical%20system%20(typically%20a%20reflector%2C%20lens%2C%20or%20optic).%0D%0A%0D%0ASo%2C%20which%20is%20more%20important%3F%20Light%20output%20can%20be%20thought%20of%20as%20%26ldquo%3Braw%20material%2C%26rdquo%3B%20but%20it%26rsquo%3Bs%20how%20that%20light%20is%20dispersed%20that%20determines%20usefulness.%20For%20example%2C%20a%20fluorescent%20lamp%20has%20high%20output%20but%20low%20intensity%20(a%20dispersed%2C%20or%20flood%2C%20beam)%2C%20whereas%20a%20laser%20and%20has%20low%20output%20but%20high%20intensity%20(a%20focused%2C%20or%20spot%2C%20beam).%0D%0ABoth%20are%20useful%20for%20their%20intended%20purposes%2C%20but%20neither%20would%20make%20a%20good%20flashlight.%20Thus%2C%20the%20candela%20per%20lumen%20(cd%2Flm)%20ratio%20can%20be%20used%20to%20determine%20if%20a%20flashlight%20has%20a%20spot-%20or%20flood-type%20beam.%0D%0A%0D%0ASpot%20beams%20(large%20cd%2Flm%20ratio)%20are%20great%20for%20lighting%20up%20distant%20objects%2C%20but%20at%20close%20range%2C%20the%20hotspot%20may%20be%20blindingly%20bright.%0D%0AFlood%20beams%20(small%20cd%2Flm%20ratio)%20are%20great%20for%20close%20work%2C%20but%20for%20distant%20objects%2C%20there%26rsquo%3Bs%20not%20going%20to%20be%20much%20light.%0D%0A%0D%0AAs%20a%20reference%2C%20well-focused%20spot%20beams%20can%20be%20over%20100%20cd%2Flm%2C%20tactical%20flashlights%20are%20typically%20between%2020-100%20cd%2Flm%2C%20and%20work%20lights%20are%20less%20than%2010%20cd%2Flm.%0D%0APeak%20Beam%20Intensity%20vs.%20Perceived%20Brightness%0D%0ABrightness%2C%20as%20we%20think%20of%20it%20in%20everyday%20terms%2C%20is%20actually%20a%20difficult%20measurement%20to%20grasp%20numerically.%20While%2010%2C000cd%20will%20appear%20brighter%20than%205%2C000cd%2C%20it%20will%20not%20appear%20twice%20as%20bright.%20The%20reason%20is%20because%20our%20perception%20of%20brightness%20is%20non-linear%2C%20meaning%20that%20%26ldquo%3Btwice%20the%20intensity%26rdquo%3B%20will%20not%20appear%20%26ldquo%3Btwice%20as%20bright.%26rdquo%3B%0D%0AKeeping%20this%20non-linear%20relationship%20in%20mind%20is%20important%20for%20making%20Peak%20Beam%20Intensity%20comparisons%2C%20and%20a%20rough%20estimate%20is%20that%20for%20a%20light%20to%20appear%20twice%20as%20bright%20to%20the%20eye%2C%20four%20times%20the%20intensity%20is%20required.%0D%0ABeam%20Distance%26nbsp%3BBeam%20distance%20is%20calculated%20from%20peak%20beam%20intensity%2C%20so%20there%20is%20actually%20no%20new%20information%20here.%20In%20addition%2C%20a%20full%20moon%20on%20a%20clear%20night%20is%20not%20really%20a%20useful%20amount%20of%20light%2C%20so%20don%26rsquo%3Bt%20put%20too%20much%20weight%20on%20this%20specification.%0D%0A%0D%0A%0D%0A%0D%0A%0D%0ARun%20Time%0D%0A%0D%0Alantern%2C%20or%20can%20be%20used%20as%20a%20flashlight%20for%20directional%20lighting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Buy Premium Water Resistant Portable LED Lantern Flashlight

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