Although more research is needed to determine how much natural and man-made blue light is "too much blue light" for the retina, many eye care providers are concerned that the added blue light exposure from computer screens, smartphones and other digital devices might increase a person's risk ...
Light bulbs are ranked by their power -- the amount of light they put out in a certain period of time (measured in watts). Higher-watt bulbs have a bigger filament, so they produce more light. A three-way bulb has two filaments of different wattage -- typically a 50-watt filament and...
Why are LED lights measured in lumens? LED lumens to watts conversion chart How many lumens do you need for different places? Gone are those days when light bulbs are measured through the wattage. Today for lights, the new unit of measurement is the lumen. For decades consumers have bought...
Rather than just focusing on GDP, over 40 different sets of criteria from health, education and civil society engagement have been measured to get a more rounded assessment of how countries are performing. 出自-2017年考研阅读原文 It is not yet clear how much more effective airline security has...
Choose the right wattage of light bulbs for your living room by considering factors like room size, desired lighting level, and bulb type. Finding the perfect balance creates a comfortable and inviting atmosphere. LED bulbs are recommended for their energy efficiency, longevity, and versatility. Con...
LED lighting has hit the lighting market with a crash, leaving many wondering which lights or light bulbs to choose - find out what you need to know.
Blue light has been shown to interfere with sleep, which is another advantage of being able to adjust your lights to warmer tones at night. Finally, not all light bulbs accurately show an object's true colors. Color accuracy is measured on the color rendering index (CRI) on a scale from...
In general, more yellow tones make a room look darker. The color temperature of a lightbulb is measured in Kelvins and most residential lightbulbs are somewhere in the range of 2000 Kelvins (more yellow) to 5000 Kelvins (more blue). ...
The brightness of an LED bulb is typically measured in lumens. Lumens determine the amount of light that is emitted from a bulb. While there is no direct correlation between wattage and lumens for LED bulbs, we can still determine the brightness based on industry standards and comparisons. Key...
As explored below, the glowing filament in an incandescent light bulb allows us to view resistance in action. PhotoLink/Photodisc/Getty Images As mentioned earlier, the number of electrons in motion in a circuit is called the current, and it's measured in amps. The "pressure" pushing the...