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August 2019

How to Calculate Lumens Per Watt

2019-08-30T16:05:53+08:00August 30th, 2019|Tags: , |

how to calculate lumens per watt The number of lumens per watt is a characteristic of each light bulb and is a measure of the bulb's efficiency. It depends on a number of factors, including how the bulb makes light, the quality of the materials from which the bulb is made and how much of the input energy is wasted as heat. The packaging tells you the number of watts of power each bulb consumes and the number of lumens of light it puts out. The number of lumens per watt is simply the ratio of these two numbers. What Is a Lumen? A lumen is defined in the SI (metric) measurement system as the amount of luminous flux emitted per second in a unit solid angle of one steradian by a source of one candela. A steradian is simply an area at a distance r from the source equal to a circle with area r2. What Is a Watt? A watt is a unit of power in the SI system. In that system, work and energy are measured in joules, and because power is the rate of doing work, one watt is equal to one joule per second. The power in an electrical circuit, which is equal to the voltage across the circuit multiplied by the current, is also measured in watts. The wattage of a light bulb is the amount of energy the bulb consumes, and it's what you end up paying for when your [...]

Glass Or Polycarbonate Outdoor Lights, Which Is Better

2019-08-23T23:41:50+08:00August 21st, 2019|Tags: , |

Glass or Polycarbonate Outdoor Lights: Which Are Best? Pros and Cons: Glass outdoor lights The primary advantage of glass is resistant to scratching. While glass can certainly still be scratched, it is inherently much more difficult to scratch than polycarbonate. Additionally, glass is still one of the most optically clear materials available, This is why it is still the material of choice for many tools outside of the lighting industry. The glass has drawbacks are just as glaring. While glass may be resistant against scratches, it has minimal impact resistance it can easily be cracked or broken altogether. Because wall packs are often installed well above eye level, it may not be evident when a unit has broken glass. The longer a wall pack remains damaged, the more susceptible its internal components are to water damage. Of course, there is also the issue of broken glass on the ground beneath the unit—if the wall pack is installed over a playground, sidewalk, or another trafficked location, there is the potential for injury during or after a break. Older wall packs not using LEDs often use light sources containing mercury, which further amplifies the risk of injury. Glass is much heavier than polycarbonate (it weighs about twice as much), so shipping glass outdoor lights will be more expensive than shipping polycarbonate outdoor lights; handling these heavier units also complicates installation and handling. Pros and Cons: Polycarbonate outdoor lights Compared to glass, polycarbonate is a relatively new option. [...]

July 2019

The difference between 304 and 316 stainless steel

2019-08-21T10:55:56+08:00July 23rd, 2019|Tags: , , |

The difference between 304 and 316 stainless steel 304 Stainless Steel Grade 304 stainless steel is generally regarded as the most common austenitic stainless steel. It contains high nickel content that is typically between 8 and 10.5 percent by weight and a high amount of chromium at approximately 18 to 20 percent by weight. Other major alloying elements include manganese, silicon, and carbon. The remainder of the chemical composition is primarily iron. The high amounts of chromium and nickel give 304 stainless steel excellent corrosion resistance. 316 Stainless Steel Similar to 304, Grade 316 stainless steel has high amounts of chromium and nickel. 316 also contains silicon, manganese, and carbon, with the majority of the composition being iron. A major difference between 304 and 316 stainless steel is the chemical composition, with 316 containing a significant amount of molybdenum; typically 2 to 3 percent by weight vs only trace amounts found in 304. The higher molybdenum content results in grade 316 possessing increased corrosion resistance. 316 stainless steel is often considered one of the most suitable choices when selecting an austenitic stainless steel for marine applications. Which Should You Use: Grade 304 or Grade 316? Here are some situations where 304 stainless steel may be the better choice:The application requires excellent formability. The higher molybdenum content in Grade 316 can have adverse effects on formability.The application has cost concerns. Grade 304 is typically more affordable than Grade 316.Here are some situations where 316 stainless steel [...]

Acrylic vs Polycarbonate

2019-08-21T12:30:58+08:00July 21st, 2019|Tags: |

Acrylic vs Polycarbonate, Which Materials is Best For LED? Acrylic light diffusers control the brightness of harsh lighting to create a soft lighting effect. They can also protect lighting fixtures from dust and help conserve energy by providing more even lighting that reduces the need for additional fixtures. Comparatively, polycarbonate extrusions exhibit higher impact resistance, stiffness, moisture resistance, and increased heat resistance.Both acrylic and polycarbonate materials provide extremely good strength-to-weight ratios, while offering tremendous flexibility and excellent light transmission and diffusion.Acrylic Light Fixture Lens Material AdvantagesAcrylic vs polycarbonate lighting diffusers offer distinct benefits that separate this material from polycarbonate. Acrylic has a high gloss finish and is more translucent than transparent, making it ideal for light diffusers. Other benefits include:Increased durability against scratchesImproved flexibilityUV resistance (no yellowing or discoloration from the sun)Less expensive than polycarbonate Polycarbonate Light Fixture Lens Material AdvantagesWhen comparing polycarbonate to acrylic material, polycarbonate offers much more resilience than acrylic, making it ideal for highly demanding applications where impact is a requirement or flame retardance. Some of the benefits of polycarbonate plastic diffusers for fluorescent lighting fixtures, include:Increased strength over acrylicImproved versatilityHigh impact resistanceIncreased stiffness & moisture resistanceNon-flammable, (FR grades are available) can be exposed to high temperaturesCan be drilled without crackingAcrylic and polycarbonate materials provide many benefits that standard glass does not afford. These advantages include increased light filtration, impact resistance, increased strength, and improved weight and viscosity flow characteristics. However, there are several distinct differences that separate acrylic vs polycarbonate lenses. [...]

Polycarbonate is a top choice for LED Lighting

2019-08-21T12:26:28+08:00July 19th, 2019|Tags: , |

Polycarbonate is a top choice for LED Lighting Polycarbonate is the top choice for LED Glass and transparent plastics, especially acrylic resins, have long been used in the lighting for various aesthetic and functional purposes. As the industry has evolved, LED lighting has moved from niche applications to more mainstream commercial and residential use, and there has been a growing interest in plastics — especially polycarbonate — because of the properties of the material and the versatility it provides. Polycarbonate is now seen in a variety of areas in LED lighting including lenses, optics, covers, channel letters, sign facing, globes, and light diffusers. LED lighting manufacturers when choosing materials — clarity in order to have great light transmission and material that allows the light source to be evenly diffused so there’s no evidence of “hot spots” on the surface. Polycarbonate features including heat resistance and transparency, are important in the LED lighting industry. LED lights can be seen in storefront signs and channel letters, traffic signals, recessed down lights, task lights, retail and refrigerated displays, street and area lights, LCD TV displays and monitors, mobile appliances, and many other applications.  When designing covers, lenses, or optics for these varied applications, one must consider the capabilities of the materials — the durability, optical properties, thermal stability, ignition resistance, design flexibility, and UV stability. Durability Durability is the starting point for light source protection especially outdoors. LED sources is much more robust than incandescent light, the materials [...]

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