A Light Emitting Diode (LED) is a semiconductor device which converts electricity into light. LED lighting has been around since the 1960s, but is just now beginning to appear in the residential market for space lighting. At first white LEDs were only possible by "rainbow" groups of three LEDs — red, green, and blue — by controlling the current to each to yield an overall white light. This changed in 1993 when Nichia created a blue indium gallium chip with a phosphor coating that is used to create the wave shift necessary to emit white light from a single diode. This process is much less expensive for the amount of light generated.

Each diode is about 1/4 inch in diameter and uses about ten milliamps to operate at about a tenth of a watt. LEDs are small in size, but can be grouped together for higher intensity applications. LED fixtures require a driver which is analogous to the ballast in fluorescent fixtures. The drivers are typically built into the fixture (like fluorescent ballasts) or they are a plug transformer for portable (plug-in) fixtures. The plug-in transformers allow the fixture to run on standard 120 volt alternating current (AC), with a modest (about 15 to 20 percent) power loss.

LEDs are better at placing light in a single direction than incandescent or fluorescent bulbs. Because of their directional output, they have unique design features that can be exploited by clever designs. LED strip lights can be installed under counters, in hallways, and in staircases; concentrated arrays can be used for room lighting. Waterproof, outdoor fixtures are also available. Some manufacturers consider applications such as gardens, walkways, and decorative fixtures outside garage doors to be the most cost-efficient.

LED lights are more rugged and damage-resistant than compact fluorescents and incandescent bulbs. LED lights don't flicker. They are very heat sensitive; excessive heat or inappropriate applications dramatically reduce both light output and lifetime.

XLHJ Group Limited offers supplies of magnesium oxide boards - a great alternative to OSB, plywood, gypsum board, and tile backer board.

Magnesium oxide board «MgO board» is a factory-made, non-insulating sheathing board product. It can be used for a number of applications including wall and ceiling linings, fascias, soffits, tile backing and underlayments. It is made of magnesium oxide, a type of mineral cement, and is commonly called simply «MgO» (pronounced emm-gee-oh) due to its chemical composition of magnesium (chemical symbol Mg) and oxygen (chemical symbol O). Think of MgO as a type of sheathing board-sort of like drywall or cement board - but with much-improved characteristics such as fire resistance, weatherability, strength, resistance to mold and mildew, and so on.

MgO is available in many forms, and for building construction comes in various thicknesses and sheet sizes. It also comes in various grades, such as smooth finishes, rough textures, and utility grades. It is white, beige or light gray in color, and has a «hard» sound when rapped with your knuckles-somewhat like portland cement board.

Like any sheathing board, MgO board can absorb water but its performance is unaffected. Thus it can be used indoors and outdoors, and in damp locations, such as showers. Like portland cement based sidings, if MgO is used outdoors in an exposed location, it needs some form of coating, such as paint. MgO can be used structurally-as in bracing for walls-and also semi-structurally, such as an underlayment for flooring.

Solar water heating is now a mature technology. Wide spread utilization of solar water heaters can reduce a significant portion of the conventional energy  being used for heating water in homes, factories and other commercial & institutional establishments. Internationally the market for solar water heaters  has expanded significantly during the last decade.  It is estimated that over 157 million sq.m. of collector area has so far been installed world wide for heating water.

XLHJ Group Limited offers range of solar energy products, such as solar water heaters, solar street lighting sytems, solar collectors and accessories. Please, request our managers for a quotation.

 Advantages and benefits of the steel-frame consctruction

• Shorter building period

Build times are typically reduced by 50-60% in comparison to traditional on-site construction methods. This faster construction, and resulting faster occupancy, reduces costs and accelerates cash flow.

• Reduced site labour

Pre-cutting and prefabrication requires less skilled labour on site.

• Superior quality

Off-site factory-based quality control and pre-design of similar modules results in superior quality products with fewer defects than on site working.

Ferromanganese is the principal deoxidizing agent in steel making and an important alloying element used for the production of ordinary mild steel as well as sophisticated low and high alloy steels. It also has the property of controlling the effect of sulphur, which when manganese is present, forms manganese sulphide and tends to float out of the liquid steel. Manganese has the effect of stabilizing austenite. Steel with 12 to 14% Mn is fully austenitic, and is used on a large scale for its wear and abrasion-resisting characteristics.

Ferromanganese, offered by XLHJ Group Limited, is exlusively made of high-quality manganese concentrate. Ask our managers for a quotation.