Lights DRI - a new word in lighting
In the process of creating lighting fixtures, humanity has moved far ahead. If you remember our grandmothers, who had dinner with a kerosene burner or a conventional beam, then modern lighting devices are simply surprising. Before the developers had the task to come up with the most powerful light sources that will work at large temperature fluctuations, cover large areas and perform a number of other functions. The result of all the lamps were DRI. This funny abbreviation has a fairly simple transcript: "mercury arc with iodides". They can work in large industrial areas, in warehouses, trade and exhibition halls, providing absolutely accurate color rendition.
Regardless of the power of the device, they all have the same structure. Such a device consists of a glass bulb coated with a thin phosphor layer, a quartz or ceramic burner filled with mercury vapor and inert gases that are in a flask, with the addition of metal halides.
Principle of operation
Various iodide mixtures are used to fill the DIR lamp, for example, thulium, cesium, holmium, sodium. They get inside the device in the form of salts, which evaporate quite easily. If you choose the right combination of these substances, you get a continuous spectrum of radiation, which meets high color rendering requirements.
When the lamp is turned on, the following happens: the constantly moving, iodide falls into the zone where the heat is high, and decomposes into metal and iodine. The latter, in turn, fall through diffusion into the region of low temperature, where their connection again occurs. Such transformations are possible only with high heating of the arc on the charge axis and sharp cooling near the walls of the device. Only iodides could not provide all the necessary conditions, so they decided that mercury was needed. Argon is used for easier and quicker ignition.
Lights DRI: characteristics
All devices have a certain power. The minimum value is 250 W, the maximum value is 3500 W. It is also important to know the voltage (for example, the DRI-400 model has 125 V). Much can tell and the current indicator, which is formed in the lamp. There are a few more special features: color code or temperature, color rendering index, luminous flux and light output. For each type of lamp, DRI has its own characteristics, indicated on the packaging by the manufacturer.
Advantages of the DIR lamp
- safety and comfort in use throughout the life of the device (on average, domestic models work 10,000 hours, foreign ones - 5-10 thousand more);
- modest operating costs;
- high luminous flux;
- different color rendering coefficient.
It should be noted that there are drawbacks to the lamp type DRI. Some of them can not be turned on immediately after they have been turned off. Prices for these products are quite high, which sometimes keeps them from acquiring them. But such high cost pays off with economy in use and excellent quality characteristics.
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