I accidentally left my phone with flash light on overnight, at first I wasn't aware of that as I found my phone dead after waking up and then found the torch light was on for 5 hours and 52 minutes, I'm really sad and feeling guilty as I don't know what kind of damage did I cause to my phone...What will happen now, please walk me through this

You have not damaged the phone or battery by running the battery flat. There is always some charge left even though it says 0, but provided it is not left in that 0 state for days then no harm done, just plug in the charger and wait, it will start charging again after a few minutes.


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Yeah happened exactly the same, did take few minutes before starting to get charged, as my battery health already went down to 91 percent in just 10 months of usage so can keeping the torch light on overnight cause damage to the battery health percentage?

It happened for the first time as I was really tired and feeling sleepy yesterday night and didn't even realise to switch off the torch light of my iPhone SE2020, I'm not gonna let this happen again. Thank you so much sir, you words gave me some strength as I was in some sort of shock today morning because I had never let my iPhone battery to go below 19% until yesterday.

Is it possible to control the camera's flashlight on a phone via a website? Say through Chrome or Firefox. I know it's possible using an Android or iOS app, which is implemented by all the flashlight apps out there. And I know one can control the cameras via the getUserMedia family of functions. If not, does anyone know when will it become available?

Edit 2:This does only works in Chrome (and maybe Opera). It does not work in Chrome on iOS, because Chrome cannot access the camera.I cannot test it on android for now. I created a new jsfiddle, with an output. If you have an android phone and it does not work for you, it will maybe tell why:

Here, it is a static class for handling flashlight. You can call flashlightHandler.accessFlashlight() when the window loads. And then use the flashlightHandler.setFlashlightStatus() method, passing it true or false, as you want the flashlight status.

I had to implement a similar feature at work and these answers helped me a lot, the thing is I needed to implement it in a React Js web app so I used some of the code provided in older answers to make a react hook to handle the usage of the device's torch (if it is available in the device). I made it into a simple react project in the code sandbox and in case anyone needs something similar in the future this might be useful

As a last resort, one could try a 3rd party full camera app that allows permanent light instead of flash. But I'm wary if 3rd party camera apps support all 3 or 4 cameras of a flagship phone, RAW, Multishot-RAW etc.

- They have a Li-ion battery, rechargeable with a USB-C cable (it's fast). What is also nice is that you can use a portable battery and plug it in the USB-C to get almost infinite lighting. Since they require little power, I have 4-way splitters to power 4 lights with one battery. Works like a charm.

- They have permanent white (all shades), permanent colour (all colors), and "scenes", which are flashing patterns, like cop car, tv static, etc. The interface is easy to use : on/off switch, one selector button and 2 directionnal buttons. The shades of white and colors are selectable by degree, and you can also choose light intensity (0-100%).

- They work absolutely everywhere. They even have a magnet in the back. one side has a male cold shoe and a 1/4-20 thread and the other 3 sides have female cold shoe, so you can put many together, for example, to create color patterns or to get a bigger light source. Personally, I often use the female cold shoes to hold hand-made reflectors and flags.

Flashlights on phones are undoubtedly a very useful feature - they can help you find things nearby in the dark and help you to be seen in emergencies. So you are probably thinking 'Why buy and carry a separate flashlight when I can use my phone?'. This is a fair question and below we will look at phone flashlight specifications, discuss when flashlights on phones are helpful and situations where they may not be so fit for purpose. This is to help you decide whether or not it would be beneficial for you to invest in a dedicated torch!



The current a phone flashlight uses is around 80 mA (milliamps) , so in theory, if a phone battery has a capacity of 4500 mAh (milliamp hours), the running time should be around 56 hours (4500/80). BUT a phone has to run its system software, which uses around an additional 200 mA when the screen is on.

We will do a calculation below, for a phone with a large battery capacity (4500 mAh), with just the flashlight app used. Note that of course, in reality, the runtime of a phone flashlight will vary from phone to phone along with any background apps used. Also functions such as Bluetooth and Wi-Fi will consume more power and make the run time of the phone flashlight significantly less - so again this is approximate runtime for a phone with a 4500 mAh capacity ONLY using the flashlight app.

The output of a phone flashlight is around 40 lumens. 40 lumens is about the same as a 2.5W filament bulb. The type of light is diffused and does not have a concentrated beam spot. Because phone flashlight beams also tend to be more spread, they will be less disturbing to eyesight. So the type of light emitted from a phone is useful in some settings such as finding an object dropped in a vehicle or looking for something under a sofa.

For activities such as nature walks, a dedicated flashlight will be more useful because the minimum output needed has to be at least around 300 lumens. Phone flashlights will also only have a maximum range of a few feet, so for camping, a phone flashlight will be very useful in a tent, but not so helpful with exploring outdoor areas in the dark.

Phones are vulnerable! Screens can crack easily even with screen protectors and hardened cases. Torches are designed to resist impact typically from 1.5 m drops and are waterproof- IP68 rated phones mean that they can be submerged in 2m of water for 1 hour! Also, if you are doing a task such as lighting up a car engine, dropping a phone will be more problematic and more expensive to replace than a flashlight and important media, files and sensitive information such as contacts may be lost.

Unless you have organised your apps and are used to your phone, it can take a while to turn on the flashlight app. Touch screens can be difficult to operate if your hands are wet or you are wearing gloves. On the other hand, dedicated flashlights are ergonomically designed for the user to easily find the switch, feel comfortable in the hand and for the user to quickly and easily get to their desired output setting.

Check out our new product the G2 and our popular E6! They are small yet powerful. If you have a keychain, why just have an ordinary one? Our G1 and G2 are great keychain flashlights - they will save your phone battery and can be USB charged, so having one which uses the same charging cable as your phone will be convenient! Most of our flashlights are USB-C compatible!

Flashlights also give you a range of carrying options- reversible clips such as on our T1 are popular as they have a variety of ways to be attached to clothing. Flashlights also have holsters and lanyards for ease of carrying and getting out quickly. Head torches are also becoming increasingly popular as they completely free your hands and can be fitted to a cap!

Many flashlights including our EDC and high output ones not only will save the battery of the phone but ones including our popular C2, D1 and E12 flashlights are also power banks designed to keep your smart phones charged! As well as being able to charge, our D1 is very much portable at just 10.5cm long, has a magnetic tail cap and a 175 degree wide angle beam!

The runtime of phone flashlights is impressive and a diffused 40 lumen output and a throw of a few feet is useful for finding objects in indoor settings, without hurting your eyes. But in an emergency, can you risk consuming your phone battery?

But why not carry both! Drop your phone in the dark? Your dedicated flashlight will help you locate it! They are affordable, help with self defence with their strobe setting, help you find objects nearby and people hundreds of metres away and help you get located in emergencies. If you are worried about carrying too many objects, consider our up and coming G2 and G1 are key chain flashlights. Our popular and compact E6 is small and easy to carry and remember you can also get a compact power bank flashlight which will not also save your phone battery, but also charge it - like our highly rated D1!

Great second phone/power bank. Took it on a camping trip and came in very handy as torch and backup charger. Nice thing is that it connects via bluetooth with my iPhone and can make calls from the same number!

Designed for multi-functional use, this reliable emergency light boasts 500 Lumens in either spotlight or floodlight modes. Recharge with the built-in solar panel or from any USB source. It can even charge your phone!

What is a blacklight and how do you make one? This is the topic of a recent MacGyver episode in which he quickly creates an improvised blacklight to find hidden messages on a wall. You can watch the scene here---and a disclaimer, I am currently the Technical Consultant for the show. But still, there's lots a great science in this one little scene.

Your eyes are sensitive to both visible and invisible light. The brightness of the light and the length of time someone is exposed determine how much it impacts the eyes. However, even a dim light, such as a reading light, can lead to discomfort if you stare directly into it for more than a few seconds.

For example, looking at the sun can damage the eyes, even during an eclipse. But permanent eye injury can also happen if your eyes are directly exposed to light that is not quite as intense over a longer period of time (days or weeks). This is called photo-oxidative damage and can lead to injury to the retina, the light-sensitive tissue in the back of the eye. Here are some other eye issues and conditions that are related to excess light exposure: 17dc91bb1f

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