LED, halogen, CFL and incandescent and the main types of light bulbs available, although incandescent lights are no longer ...

Here’s how it works. The speed of light traveling through a vacuum is exactly 299,792,458 meters (983,571,056 feet) per second. That's about 186,282 miles per second — a universal constant ...

A slit lamp is a type of microscope. It has a very strong light that can be concentrated into a thin line. For the test, you'll sit in a chair and rest your chin and forehead against supports on ...

Fluorescent probes are molecules that absorb light of a specific wavelength and emit light of a different, typically longer, wavelength (a process known as fluorescence), and are used to study ...

During the examination, your doctor may perform a transillumination test, shining a strong light through the scrotum to help identify any cancerous lumps. Early detection is critical, so don’t ...

Does your home have a lot of built-in light fixtures, such as recessed lighting ... Find out more about how we test, analyze, and rate. The Leviton Decora Smart WiFi Motion sensing Dimmer ...

A squeaky or loud ceiling fan is often caused by the fan blades being out of balance. Here's how you can use fluorescent ...

This is the body's 24-hour sleep-wake cycle. It naturally responds to light and darkness, and it dictates when we get hungry, when we get sleepy and when it's time to wake up. Think of it as an ...

I've also included links to buy light bulbs from our tests, and I'll keep this updated as I test new products ... to use a mix of different lamps and fixtures that serve different purposes ...

Is your home feeling a bit stuck in time? Even the most well-loved spaces can start to look outdated without realising it ...

where light rail is expected late next year. A trip through the eastbound track Tuesday morning and a similar test last week on the westbound track found no obstacles brushing against the railcars ...