That depands mainly upon your age. As we get older, our eyes naturally deteriorate. This is called Prebyopia. As the deterioration progresses, more light may be required in order for you to able to read clearly, even with spectacles. I don't advise reading in dim light though, it will only put unnecessary strain on your eyes
If the current is stronger then the bulb will be brighter.The reading is much easier when you sit under the brighter bulb.
The brightness of a bulb is directly related to the amount of light it emits, which can affect the ease of reading. A brighter bulb typically provides more illumination, making it easier to read in low-light conditions. Conversely, a dimmer bulb may strain the eyes and make reading more difficult.
A light meter reading chart provides information about the intensity of light in a specific area. It can help determine the appropriate settings for cameras or exposure levels for photography, as well as assess the brightness of a space for various purposes such as film production or interior design.
If the current is stronger then the bulb will be brighter.
By reading the back of it and the cover.
800 lumens is considered a moderate brightness level, suitable for various lighting needs. It can effectively illuminate small to medium-sized rooms, such as bedrooms or home offices, and is also appropriate for task lighting, like reading or cooking. For comparison, a typical 60-watt incandescent bulb emits around 800 lumens, making it a familiar reference point for brightness.
That would be sequential reading or writing, as appropriate.
I think the electric book is slightly worse for your eye sight because of the brightness. It depends on what device you read the book on. If you are reading on an eReader with an eInk screen, then only natural light is used. If you are reading on a device that has a back-lit screen then that may eventually lead to eyestrain, like watching too much TV.
3.33
30000 wats!
To accurately measure the brightness of a fluorescent bulb, you can use a light meter or a lux meter. These devices measure the amount of light emitted by the bulb in units called lux. Place the meter close to the bulb and take a reading to determine its brightness.
To determine the appropriate strength of reading glasses for your vision needs, you should visit an eye care professional for an eye exam. They will assess your vision and prescribe the correct strength of reading glasses based on your specific needs.