LED Bulbs- Enclosed versus Non-Enclosed Fixtures

Just because LEDs operate at cooler temperatures than traditional lamps, such as incandescent lights and CFLs, it does not mean that the modern luminaries can withstand all types of configurations and designs.

Enclosed Fixture Dilemma

Some LEDs come with a distinct warning for use in enclosed fixtures. Lighting manufacturers discourage consumers from using the bulbs in completely enclosed settings, due to heat dissipating issues. Simply put, in fully enclosed environments, LED Light fixtures have a difficult time managing heat, which can cause the temperature to rise inside the housing. Because enclosed designs are tight, heat has nowhere to go, and ends up going back to the bulb. Forcing an LED to function inside an enclosed fixture would greatly lower its lifespan, and cause inconsistent performance (flickering, shifts in color temperature and/or premature failure). It’s important to consider that abnormal conditions directly affect an LED’s ability to produce light. On the other end of the spectrum, if the bulb was exposed to bone-chilling temperatures below its standard operating threshold, it would also display signs of degradation.

Some LEDs are designed to withstand high temperatures in tightly designed housings. The best way to know if an LED light can be used in enclosed environments is by checking the label. Buyers should pay close attention to normal room temperaturerecommendations, which is not the same as junction temperature settings.When in doubt, purchase LED units that are approved for enclosed fixtures. Alternatively, one could also opt to use lights that rely on older technology, including incandescent and CFL bulbs.

LED Thermal Management

The main concern with enclosed fixtures is the lack of vents or holes, which results in stagnant air flow and rapid accumulation of heat. As established earlier in the article, poor heat dissipation and high ambient temperatures can cause lumen depreciation or force an LED bulb to fail prematurely. Heat and LED light performance have an inverse relationship: when the temperature of the luminary’s junction increases, the light output of the lamp decreases. However, the performance of the light can recover, when the LED cools down or is exposed to lower temperatures.

Heat from LEDs is typically removed using conduction or convection. With focus on the latter method and considering that trapped air is not efficient in conducting heat, some designs have holes at the top and bottom side of the unit to promote vertical air flow over the light. Sealed environments, including enclosed fixtures, go against such designs, causing heat to build up around the LED.

Junction Temperatures and Epoxy Resins

LED junction temperatures are affected by the surrounding temperature of the fixture, the current going through the unit and the efficiency of the heat sinking components in and around the light. To ensure consistent performance at high ambient temperatures, some manufacturers install a compensation circuit in the unit, which adjusts and maintains the current running through the LED. This solution is not always effective, and exposure to high temperatures could still cause overdriving in LEDs with compensation circuits- ultimately shortening its intended lifespan.

Interestingly, high temperatures also have negative effects on epoxy resin qualities inside LEDs. Most LEDs are encapsulated in transparent, epoxy resin. At high temperatures, the resins shift and expand from a solid to a rubber-like state. To prevent such occurrences from contributing to the failure of the LED, the junction temperature must be maintained below the maximum temperature threshold of the epoxy resin. When the resin expands and contracts rapidly due to exposure to high temperatures, wire bonds inside the LED become displaced, resulting in untimely degradation of the affected wires.

 

 

Buy Sustainable Windows and Reap Energy Savings

All homes can gain or lose their heating or cooling through the windows, which turns into higher energy costs and less comfort for the home’s occupants. Therefore, an easy and efficient remedy to any escaping heat or cold is the addition of the right type of window. Typically, double-glazed windows offer ideal results in this respect. For example, during the colder times of the year, you will notice fewer draughts and the windows keep out the outside heat during the warmer months.

Why Double-Glazed Windows are Popular

Double-glazed windows work because they were originally designed for extreme climatic conditions. Now they are used worldwide. As a result, people enjoy more comfort, whether they are in a commercial, residential or retail environment. The windows feature an insulated barrier that also dampens outside noises, ensuring a more tranquil atmosphere.

Energy-efficient windows such as the double-glazed variety are also more resistant to the buildup of condensation and need minimal cleaning. When made of premium materials, both double-glazed doors and windows offer years of use and substantial energy savings.

Easy to Maintain

The cost you pay for an energy-efficient window will depend on the material, size and quality of the installation. Fortunately, double-glazed glass is featured in uPVC frames. Therefore, any of the uPVC windows for sale are exceptionally durable and easy to maintain. The material of the windows stands up to rust, corrosion, or termites. The windows are also available in a number of attractive colours that range from white to natural wooden-looking shades. The windows can be custom-designed as replacement components or used in new construction.

Windows can be installed so that the upgrade meets with a buyer’s building schedule or renovation. The glass that is ordered should be chosen based on the climate. Windows are available in tilt-and-turn models, tilt-and-slide styles, casement styles, sliding upgrades or fixed-window designs. Therefore, the windows you choose can accommodate your specific project by offering both aesthetics and functionality.

The Benefits of uPVC Frames

uPVC frames themselves don’t ever need sealing or painting, which significantly lowers the maintenance required over the window’s lifetime. The frames and glass can easily be maintained and cleaned with water and detergent. uPVC is also exceptionally resilient as it has been used in sewer and water pipe installations for the last century. The vinyl windows are so durable that windows made of uPVC 25 years ago are still being used today. Good quality window frames made of uPVC are tested for UV resistance to make sure they won’t fade in Australia’s harsh sun.

uPVC also does not rot and, as stated above, resists corrosion. The material is also non-conductive, meaning it does not transfer heat and therefore maintains a more consistent temperature inside a building. The combination of double glazing and an uPVC frame makes for an exceptionally energy-efficient window.

When choosing auPVC window, you may want to consider a tilt-and-turn as the window system can open in two directions, thereby providing cross-ventilation for the consumer. The noise reduction offered by a double-glazed uPVC window amounts to about 70% overall. The windows are not only well-suited to coastal properties, but they also can resist bushfire attacks. Highly secure, the windows are also recyclable, making them the ideal windows to install not only in Australia but in any part of the world.