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Can shining a flashlight in your eyes make you go blind?No. Commercially available flashlights may temporally overwhelm and "bleach" the photoreceptors but this effect is reversible. On the other hand if the light is bright enough (i.e. the sun or a laser) you can go blind from staring at either of these for a prolonged period of time. The damage is related to the intensity of the light source and the duration of exposure. With that said, you should avoid exposure to bright lights for an extended period.This answer is not a substitute for professional medical advice. This answer is for general informational purposes only and is not a substitute for professional medical advice. If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Quora users who provide responses to health-related questions are intended third party beneficiaries with certain rights under Quora's Terms of Service shining a flashlight in your eyes make you go blind?
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Why do fireman not have their flashlights built into their hard hats, or do they use some sort of hands free work lights?
Firefighters generally may need "intrinsically safe" lights which can enter potentially dangerous situations without setting off gases.A lot of them tend to use Surefire G2 series lights and such. These kinds of lights are very rugged and there are many aftermarket clamps to connect them to a hat. However, they may choose to have a separate flashlight because sometimes you need to point your light in a direction other than where you squish your head into (imagine into a small space).In Australia, a lot of them tend to use Sabre Lights. This is probably because they were bought in bulk years ago and too expensive to replace with newer lights.
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Do LED UV blacklight flashlights emit radiation or since it's LED they don't?
Light is one of many forms of electromagnetic radiation. No matter what is the source, if it is a light it is a radiation. Period.Do the LED light follow Planck's equation? No, Planck developped the equation for black body radiation. LEDs work on completely different principle so they have completely different spectrum.Do the UV LEDs emit ionizing radiation? Yes, they do. If the energy of the photon is high enough to excite bound electron (with negative potential energy) to free state (potential energy equals to zero), it can ionize. The more energetic radiation, the broader the options what can be ionized. It is called photoeffect.nVisible light can ionize complex structures where potential energies of the topmost electrons are close to zero, UV light can ionize semiconductors, hard X-ray can ionize electrons on the lowest energies, neutrons can excite (meta)stable nuclei and initiate nuclear fission.
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What are some games which use flashlights?
Alan WakenFlashlights were an integral part of Alan Wake. Its actually a weapon as you destabilize enemies with flash and finish them with guns. The running animation of Alan with a flashlight looks very impressive. Doom 3nFlashlight could only be used in the place of a gun, this was changed in the subsequent Doom BFG EditionAmnesia : The Dark DescentnMade superb use of lamp with solid light effects. You collect oil to refill the lamp and moving in dark areas (without using the lamp) made you dizzy.nUncharted And The Last of Us:nWhile the use of torch/flashlight didn't bring anything new to the gameplay. It was used well and had a few memorable sequences like thesenThe upcoming game Dark Souls 2 is going to make interesting use of torches. They give you the choice of either not seeing the enemy in dark and dying or seeing them and dying.n
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What is the best black flashlight?
Dark light flashlights may be a great deal of fun. I also recall going to a stone and mineral museum and visiting minerals shine brightly under UV lights.Within this informative article, I will discuss a couple of whom I believe to be among the greatest black lighting flashlights you may get. Now, I am not saying that there are not even far better ones on the market. . .but what I have done is located those UV flashlights which unite both high quality AND affordability. Therefore, if you are wondering where you can purchase a blacklight flashlight, then I will point you at the appropriate directions. Below is a listing of those black light flashlights I am reviewing in this informative article. Below this list is the place I split down each flashlight.
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What are some common devices which use AA batteries?
Here's my short list of the devices around my house using AA batteries - Cheers!TV / AV Remote ControllersWireless Outdoor Light ControllerComputer Keyboard, Mouse, Trackball (Best Wireless Trackball Mouse - Logitech M570 )Garage Door ControllersWireless DoorbellLED FlashlightsKids Toys (Best Interactive and Talking Toys )Pet Toys ( 3 Tech Toys Cats Will Love )Smoke Detector / Alarm (Best WiFi Smart Alert Smoke and Carbon Monoxide Detectors for 2018 )Wireless Alarm SensorsTravel Alarm Clock (Best Portable Travel Alarm Clocks Under $10 )Wall ClockBattery back up for A/C clockBattery back up for A/C outlet timersArduino / Hobby BoardsRemote Control (R/C) toysElectric Drink Mixer / FrotherAnd if you are looking for more info on best batteries, check out these reviews:The Best Alkaline AA, AAA BatteriesLongest Lasting Lithium Ion AA, AAA BatteriesWhat do you use AA batteries for?
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Why are ultra capacitors not able to replace the car batteries?
Because of its Energy Density and the self discharge problems...... Ultra capacitors have less energy density. Research is going on to improve the energy density. Self discharge is one more biggest problem of ultracapacitors, which drag them away from the present day applications. But in future we may see an Ultracapacitor replacing the car batteries. Cost is also one more factor. Because of their instant energy supply (high power density), Present day applications of ultracapacitors are n1) Supercapacitors are used in defibrillators where they can deliver 500 joules to shock the heart back into sinus rhythm. n2) Supercapacitors deliver power for photographic flashes in digital cameras and for LED life flashlights that can be charged in, e.g., 90 seconds.n3) In applications with fluctuating loadsnAs of 2013, portable speakers powered by supercapacitors were offered to the market.
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Flashlights and car headlights all have concave mirrors. Why would it not be a good idea to use a convex mirror instead?
Flashlights and car headlights all have concave mirrors. Why would it not be a good idea to use convex mirrors instead?When we use a flashlight or a car headlight we want the resulting light to be concentrated in a certain area which we want to see clearly.The light emanating from the bulb used in a flashlight or a car headlight spreads out is all directions. So we need something to ensure that most of the rays of light converge towards the desired direction. For this purpose we need a converging mirror and hence concave or parabolic mirrors are used.A convex mirror is a diverging mirror. Rays of light which are close to each other move away from each other after reflection on the convex surface, which is not what we want. Hence convex mirrors are not used.
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What is the cheapest and easiest way to design and build a small batch of plastic flashlights?
Old plastic tubes, LEDs, battery, copper strip for the battery housing / internal connections and a push switch.Some of this could be recycled components.This answer is not a substitute for professional legal advice. This answer does not create an lawyer-client relationship, nor is it a solicitation to offer legal advice. If you ignore this warning and convey confidential information in a private message or comment, there is no duty to keep that information confidential or forego representation adverse to your interests. Seek the advice of a solicitor in the appropriate jurisdiction before taking any action that may affect your rights. If you believe you have a claim against someone, consult a solicitor immediately, otherwise there is a risk that the time allotted to bring your claim may expire. Quora users who provide responses to legal questions are intended third party beneficiaries with certain rights under Quora's Terms of Service is the cheapest and easiest way to design and build a small batch of plastic flashlights?.
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How does a self-exciting induction generator work?
Simple: All generators are just motors working "backward."Apply a voltage and current to a motor, get motion.Apply external motion to a motor, get voltage and current out at the terminals. It's Faraday's law of induction:nThe induced electromotive force in any closed circuit is equal to the negative of the time rate of change of the magnetic flux through the circuit.nOr, in mathematical terms,nwhere phi is the magnetic flux (that is, basically magnetic field intensity times loop area).You can take any old electric motor or generator and replace the combustion or anything else that causes the dynamo or motor to turn with something that you can crank by hand or by pedaling a bike, and Voila! Instant generator. It's how these things work, and it's also how Mechanically powered flashlights work.The principle inside is a very old principle. Their device just happens to be well designed for the specific purpose.
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Does the US military actually have flashlights attached to their weapons for nighttime assaults?
Thanks to the experiences of the Vietnam War, the U.S. military learned that the force that controls the night controls the battle. As such, they invested untold sums into developing Night Vision technology, as well as the training in the use of night vision in combat. At this time, even 11B soldiers receive training in their use, and how to operate a combat mission with them.A flashlight would be counter to that philosophy, since the whole reasoning for night vision is the ability to operate in low/no light conditions. If they want to blind someone, they'd use Willie Pete (white phosphorous) or flash-bang grenades. Otherwise, the idea is to slip into the combat zone with little to give away their position, and extreme attention is paid towards minimizing their "battle rattle" anything that would reflect light. Hell, even the uniforms are designed to reduce IR signatures.
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Do movies and TV shows use extra-bright flashlights?
Links are mainly to 'educational' refs with background info on each topic, rather than IMDB/wikipedia etc.You can see the beam because "movie smoke" is used in nearly every shot these days. You often can't really 'see' it in the shot, but it makes lights look good.
Earlier this week, they were actually using 'smoke in a can' which I'd never seen before, to supplement the usual smoke machine. Youtube link to 6 min video on 'smoke in a can'.Modern cameras can use any old light source, they really don't need anything extra-bright.
Notable recent movies using only natural light include The Witch & of course The RevenantIn earlier times it was only possible by using incredibly wide aperture lenses - famously Kubrick's Barry Lyndon did this.
I have never in my life been anywhere close to a T0.7 lens... they are the stuff of dreams. Also see Wikipedia - Theatrical smoke & fog
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You are got a coupon.":"تهانينا! لديك قسيمة.","Congratulations! You are got all coupons.":"تهانينا! لديك كل كوبونات.","Continue":"استمر","Continue Shopping":"مواصلة التسوق","Copy the code and use it directly in the shopping cart.":"انسخ التعليمات البرمجية واستخدامها مباشرة في عربة التسوق.","Country":"بلد","Coupon code":"رمز الكوبون","Coupon List":"قائمة الكوبون","Date":"تاريخ","days after receiving":"أيام بعد استلامها","Design customization":"تصميم التخصيص","Do not use any discount":"لا تستخدم أي خصم","Earliest":"باكرا جدا","Export successful":"تصدير ناجح","Export failed":"فشل التصدير","email":"البريد الإلكتروني","email format does not match":"تنسيق البريد الإلكتروني غير متطابق","Estimated Delivery Time":"يقدر وقت التسليم","Effective Order Count":"عدد الطلبات الفعالة","Effective Sale Amount":"مبلغ البيع الفعال","Expense":"مصروف","expired":"منتهية الصلاحية","export a report?":"تصدير تقرير؟","Failed to upload files.":"Failed to upload files.","FAQ":"FAQ","Find Parts":"العثور على أجزاء","for order over":"للطلب أكثر من ذلك","Free":"حر","Free Quote & Information Request":"طلب اقتباس مجاني ومعلومات","Free Shipping":"الشحن مجانا","Get":"احصل على","Get coupons":"الحصول على كوبونات","Get discount":"الحصول على خصم","Get it":"احصل عليه","Get it after logging in and use it in the shopping cart.":"احصل عليه بعد تسجيل الدخول واستخدامها في عربة التسوق.","Go to Page":"انتقل إلى صفحة","Highest Price":"اغلى سعر","home":"الصفحة الرئيسية","Hot Sale":"عرض ساخن","Income":"دخل","Incorrect form format":"تنسيق شكل غير صحيح","inquiry":"استفسار","join guide":"دليل الانضمام","Last 30 days":"آخر 30 يومًا","Last 7 days":"اخر 7 ايام","Links report":"تقرير الروابط","Loading":"جار التحميل","Lowest Price":"أقل سعر","Match Product":"تطابق المنتج","Merchant Free Shipping":"التاجر شحن مجاني","message":"رسالة","Most Popular":"الأكثر شعبية","my account":"حسابي","my coupons":"كوبونات بلدي","my inquiry":"استفساري","my orders":"طلباتي","my reviews":"مشاريعي","my wishlist":"قائمة امنياتي","name":"اسم","New Arrival":"قادم جديد","Newest":"الأحدث","No Quotation":"لا اقتباس","No time limit":"لا يوجد حد زمني","Not deleted":"لم يتم حذفها","not valid yet":"غير صالح بعد","Off":"عن","Offers and Discounts":"العروض والخصومات","ok":"موافق","Only DOC,DOCX,PDF,PNG,JPEG and JPG files can be uploaded":"يمكن تحميل ملفات DOC و DOCX و PDF و PNG و JPEG و JPG فقط","optional":"اختياري","order notes":"ترتيب ملاحظات","Order over":"النظام","order id":"رقم التعريف الخاص بالطلب","order status":"حالة الطلب","order amount":"كمية الطلب","Orders Report":"تقرير الأوامر","Other":"آخر","Password contains at least numbers and letters length should be 6-20":"تحتوي كلمة المرور على الأرقام على الأقل ويجب أن يكون طول الحروف 6-20","Password is invalid":"كلمة المرور غير صالحة","Password length should be 6-20":"يجب أن يكون طول كلمة المرور 6-20","Paypal":"باي بال","paypal payment":"الدفع باي بال","Pending":"قيد الانتظار","Pending Commission":"اللجنة المعلقة","personal info":"معلومات شخصية","Please click ’click to continue’ to retry.":"يرجى النقر فوق \"انقر للمتابعة\" لإعادة المحاولة.","Please contact customer service for cash withdrawal":"يرجى الاتصال بخدمة العملاء للحصول على السحب النقدي","Please enter a valid email address":"يرجى إدخال عنوان بريد إلكتروني صالح","Please enter the verification code":"الرجاء إدخال رمز التحقق","Please login in first":"يرجى تسجيل الدخول أولا","Please select attribute":"يرجى اختيار السمة","Please select country/region":"يرجى اختيار البلد / المنطقة","Please select superior":"يرجى اختيار متفوقة","Please select the number of ratings.":"يرجى اختيار عدد التصنيفات.","Please select your country":"الرجاء تحديد بلدك","Please upload the invoice file":"يرجى تحميل ملف الفاتورة","Processing":"يعالج","Product Name":"اسم المنتج","Please fill in the delivery address before selecting the payment method":"يرجى ملء عنوان التسليم قبل اختيار طريقة الدفع","promotion center":"مركز الترويج","Promotion Link Click Amount":"رابط الترويج انقر فوق مبلغ","Promoted link clicks":"نقرات الارتباط التي تمت ترقيتها","Promotion Order Count":"عدد أوامر الترويج","Promotion Reports":"تقارير الترويج","read more":"اقرأ أكثر","Received commission":"تلقت عمولة","Refund":"استرداد","Refuse":"رفض","Region":"منطقة","Register Success":"سجل النجاح","Remittance":"التحويلات","Reviews":"المراجعات","reports":"تقارير","Sale ends in":"بيع ينتهي في","Save in wishlist":"حفظ في قائمة الأمنيات","Search":"بحث","swift code":"رمز السرعة","Select how to share":"حدد كيفية المشاركة","Select premium items to increase your chances of making money":"حدد العناصر المتميزة لزيادة فرصك في كسب المال","Share items to your channels.when other purchase a from your link, you can get commission.":"مشاركة العناصر إلى قنواتك. عند الشراء الآخر A من الرابط الخاص بك ، يمكنك الحصول على العمولة.","Share Product":"مشاركة المنتج","shipment successful":"شحنة ناجحة","Shipping":"الشحن","Shipping Address":"عنوان الشحن","Size guide":"دليل المقاسات","Small Text":"نص صغير","Small Title":"عنوان صغير","Sort By":"صنف حسب","Sales Amount":"مبلغ المبيعات","State/Province/Territory":"الدولة / المقاطعة / الإقليم","Successfully delete":"حذف بنجاح.","Successfully save":"حفظ بنجاح.","Thank you for trying":"شكرا على المحاولة","The account has been deactivated, please contact customer service to activate":"تم إلغاء تنشيط الحساب ، يرجى الاتصال بخدمة العملاء لتفعيلها","the content can not be blank":"المحتوى لا يمكن أن يكون فارغا","The coupon code has been copied and used in the shopping cart.":"تم نسخ رمز القسيمة وتستخدم في عربة التسوق.","The file name cannot exceed 100 characters":"لا يمكن أن يتجاوز اسم الملف 100 حرف","The file size cannot exceed 2MB":"لا يمكن أن يتجاوز حجم الملف 2 ميجابايت","The number of withdrawals on the day has been capped":"تم توج عدد عمليات السحب في اليوم","The subscription is successful, thank you for your participation":"الاشتراك ناجح، شكرا لك على مشاركتك","The user center is out of service. Please contact customer service":"مركز المستخدم خارج الخدمة. يرجى الاتصال بخدمة العملاء","There is no amount to withdraw":"لا يوجد مبلغ للانسحاب","There is no data to export":"لا توجد بيانات للتصدير","This is Text":"هذا هو النص","This is title":"هذا هو العنوان","This transaction has failed.":"فشلت هذه المعاملة.","Time to shop":"الوقت للتسوق","Tips":"نصائح","To be commented":"ليتم تعليقها","Total":"المجموع","Tutorial":"الدورة التعليمية","This Supplier/Shipping Company does not deliver to your selected Country/Region.":"لا تقدم هذه الشركة/شركة الشحن إلى بلدك/منطقتك المختارة.","Update password success":"تحديث نجاح كلمة المرور","Upload Image":"تحميل الصور","Upload up to 6 pictures":"تحميل ما يصل إلى 6 صور","uploading":"تحميل","used":"تستخدم","user center":"مركز المستخدم","Upload Invoice":"تحميل فاتورة","valid now":"صالح الآن","Validity period":"فترة الصلاحية","View Cart & Checkout":"عرض العربة","views":"الآراء","Valid for":"صالحة ل","Welcome to the website":"مرحبا بكم في الموقع","Western Union":"الاتحاد الغربي","When your buyers received and confirmed orders, you can get commission right now!":"عندما تلقى المشترين أوامر مؤكدة ، يمكنك الحصول على العمولة الآن!","Withdrawal":"انسحاب","Withdrawal success":"نجاح الانسحاب","Withdrawal Method":"طريقة السحب","Write a Review":"أكتب مراجعة","Withdrawal Amount":"كمية السحب","Yes":"نعم","Yesterday":"في الامس","You are clicking too fast":"أنت تنقر بسرعة كبيرة","You are got a coupon.":"لديك قسيمة.","You can select a maximum of 90 days":"يمكنك تحديد 90 يومًا كحد أقصى","You can withdraw the commission to your Paypal account.":"يمكنك سحب اللجنة إلى حساب PayPal الخاص بك.","You haven’t chosen an address yet":"لم تختار عنوان حتى الآن","You haven’t selected a product yet":"أنت لم تختار منتج حتى الآن","Your rating":"تقييمك","Your review":"مراجعتك","Your shipping address error":"خطأ عنوان الشحن الخاص بك"}}