Weblight bulb: [noun] an electric lamp: such as. one in which a filament gives off light when heated to incandescence by an electric current — called also#R##N# incandescent, incandescent lamp. fluorescent lamp. WebConfusingly, "went off" can mean "turned on". The phrase "a light bulb went off (in my head)" literally means "a light bulb turned on in my head" and figuratively means "suddenly, I understand" or "suddenly, a great idea has occurred to me". This use of "went off" can also be seen in "my alarm clock went off" (meaning: my alarm clock just rang).
How to buy LED lighting: Common specs explained
Web17 Mar 2015 · Light Spectrum: the wavelengths a grow light can emit. PAR Wavelengths: these are wavelengths of light that plants can use (400nm - 700nm) Photons: particles of light from the PAR range. Micromoles (μmol): how many photons. 1 μmol = 602 quadrillion photons! Grow Light Efficiency (µmol/W): how many micromoles (μmol) per W. WebLumens is best described as the measurement of light. A single CFL and LED bulb might have the same lumen (brightness) output but vary greatly in the amount energy needed to generate that level of brightness. Many LED bulbs in the past were not omnidirectional which gave the upper hand to CFL in various scenarios. gwendolyn foxworth
A Guide to Light Bulb Sizes, Shapes, and Codes - GE Lighting
Web11 May 2024 · What is a PAR 38 light bulb used for? Most of the PAR38 BULBS are used outdoors. Flood and safety lights are possible with the use of PAR38 bulbs. When light is required to reach farther, the PAR38 bulbs are perfect because of their higher wattage options. What does PAR 38 led mean? There is a type of light bulb called the PAR 38. The … WebWhat does the term “par20 light bulb” mean? PAR (parabolic aluminized reflector) 20 bulbs with a more precise control of light. They’re used in recessed and track lighting because they produce about four times the concentrated light intensity of standard service A shape incandescents. The 20 value, like all light bulbs, represents the ... WebThe Shapes and Sizes. The first thing to understand is what the numbers 30 and 40 refer to. These two numbers refer to the bulb size in 1/8-inch increments. So, a BR30 is 30/8 inches while the BR40 is 40/8 inches. Or to put it more simply, the BR30 bulb is about 3.75-inches wide while a BR40 bulb is about 5-inches wide. gwendolyn fountain