LED Lighting – thermal management

High Power LEDs develop by the current flow in the semiconductor such as other light sources and heat. To ensure normal luminous flux and life, the maximum junction temperature of the LEDs even in continuous operation are not exceeded. ERCO therefore places particular importance on the thermal management in the light, so that the LED modules operate below the critical temperature range and provide throughout the life of their full capacity. ERCO uses passive heat sinks, which are maintenance-free and reliable, and in contrast to active systems do not consume additional energy. The thermally optimized design reduces the principle of LEDs light depreciation occurring during heating to a minimum.

Heat dissipation via housing

When radiators can be efficient heat dissipation from the LED module over the housing. Through the material aluminium alloy has the lamp a good thermal conductivity and high heat capacity. Large-area connections of rear panel and LED board ensure good heat conduction.

Heat dissipation fins, the correct design of cooling fins ensures at Downlights healthy thermal conditions. The position, length and thickness of the fins undergo thermal simulations in the design process efficiently dissipate heat through optimal design.

Dissipation through heat transfer plate

In certain forms of housing, such as cylinder-mounted lights for outdoors, it may be necessary for the thermal coupling between the LED module and lamp housing to use an additional heat sink plate. Here also be designing and sizing due to thermal simulations in the design process.

Thermal Simulation

Thermal coupling

The strong bond of the LED module to the housing of the lamp creates the best conditions to derive the heat: A principal advantage of such integrated LED solutions to all types of retrofit solutions.

Housing ribs

The cooling fins on the back of the housing Powercast increase surface area and allow for optimal delivery of the LED heat by radiation and convection.

Heat Dissipation

Thermal simulations

Early in the design phase of LED, lights create the engineers at thermal simulations to optimize the thermal management. Tests in the test laboratory also demonstrate the high quality of the detailed simulations and ensure excellent light performance in practice.

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Samsung Ativ S Multimedia

The rear main camera of the Samsung S Ativ the test has a resolution of 8 megapixels and delivers a sufficiently large aperture (f/2.6), LED photo light and video in full HD quality (1080p). To focus on the subject and for triggering of shutter the user types either to a selected area on the touch screen or press the dedicated camera button on the side edge.

The picture quality when shooting outdoors with the camera of the Samsung S Ativ the test turns out relatively well. The images are sharp and colours give the greatest possible extent, of course, again, the noise turns out small, and also the dynamic image is not as bad as many other smartphones. Even when shooting video, there is little tearing effects and a decent sound, the sharpness is also true.

The music player provides via the supplied in-ear headphones have a decent, but too low for demanding bass and tinny sound. With higher quality headphones can improve the listening experience, the lack of equalizer makes Ativ S but not exactly the first choice for music lovers. The back sitting beneath the perforated trim speaker is loud enough for the sound systems, but rattles slightly at maximum volume, and sounds a bit tinny.

Phone functionality, connectivity and battery life

For mobile data transmission, that supports a micro-SIM card-operated Samsung Ativ S test in addition to GPRS and EDGE and UMTS. HSPA + accelerator with the data transfer rates of up to 42 megabits per second Downtream The up to 100 megabits per second, fast high-speed LTE standard has not mastered the Samsung Smartphone.

Such high data rates, although for mobile Internet use via smartphone yet completely oversized, but LTE extends the theoretically available broadband network coverage area, because in some (rural) areas namely LTE, but there is no UMTS. For Internet, access at hotspots as well as for the media streaming on your home network supports Samsung Ativ S WiFi n with Wifi Direct.

Sony Xperia Z Video

When capturing video, you can set not only as photos or sports scenes such as night mode, but also take photos while recording video with 1 megapixel. This is done via a second virtual trigger, which was placed over the video trigger. A surprise is the sequence mode. There you can expect as your photos with different effects, which will be shown live – about fisheye lens or drawing. The secret is that all nine possible effects appear reduced simultaneously.

With so much calculation in the background, however, it comes to visible imperfections. Panoramic shots are not convincing. A slow the phone creates them. Distortions of the day here, which makes the competition better. Lack of logic appears to us also at the top of the display-arranged point “Scene Selection”. Because the different modes such as night vision or backlight compensation were set in video mode, logically see a submenu and would fit better photos in a submenu.

Their own “main menu items” for front photo and video front we seem superfluous, because in each mode from the main camera, there is always the bottom right of the screen is also a button to switch the cameras. Sony should here have been wanting for some time for a coherent operation.

Nevertheless, we come to the main point at the camera: the quality. Let us make it short – real enthusiasm will not arise. While photos are not bad at all, but a lack of sharpness especially. We had that at 13 megapixels really expected better. 13 megapixels are already almost a sham, because the highest resolution is 12 megapixels, according to camera menu and hide behind even only 11.5 megapixels in 4:3. Full 13 megapixels (actually 12.7 megapixels) can be exploited only if one uses the normal mode and waives HDR.

In addition, we had expected more from the new Exmor sensor RS. Little noise? None, or at least only in certain situations. Less than its predecessor, perhaps, but that was from this point of no paradigm. Noise is also here clearly visible.