blog Post They are the best LED lights or lamps HDI ?


Oct

31

2017

They are the best LED lights or lamps HDI ?

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LEDs have received great attention in recent times, but they really have what it takes to overcome the tried and true favorites in the category HID? Let's find out ...lampade a led hemp

Applications

In the past, HID lights were often the ideal choice for applications in which it needed a large amount of light visible at a considerable area. Practical examples are found in street lights, in gyms, in stadiums, in warehouses and buildings, high-ceilinged. The HID lights, however, I am not a perfect solution because the light they produce is not always pleasant to the eyes, and in most cases require a prolonged heating time. Thanks to technological advances, LEDs are now a viable alternative in many HID applications - while presenting also a number of pros and cons.

Overview

Before delving into the advantages and disadvantages in HID and LED lighting, we start torches concrete idea about, deepening the method of operation of each of the two lighting systems.

of light-emitting diodes (LED)

Unlike incandescent bulbs, using a filament, CFL, which make the gas use, LEDs create light by excited electrons. Within ciaLED close upScuna LED bulb there is a semiconductor material consisting of parts of positively charged and negatively. When the light is turned on and an electric energy affects the semiconductor, the electrons become loads and begin to flow from negative to positive within the semiconductor. As soon as the excited electrons pass through the “holes” in the material, emit photons of light and cause the LED lighting.

Bulbs High Intensity Discharge (HID)

The HID are a type of arc discharge lamps of gases that create the HDI lamplight transmitting an electric current between two electrodes and an ionized gas. The light radiates from the arc when the charged electrons orbit change and interact with the gas. Everything is hermetically sealed within a glass capsule in quartz. Usually, also it used an extra gas, that helps to distinguish the main types of HID: sodium, mercury and halide metallO. Each HID requires a reactor to adjust its power and to create the first increase electricity that allows light to start. These lamps are known to produce a greater illumination of the halogen lamps consuming, at the same time, less power.

For the pros and cons: Comparison between LED and HID bulbs

HID LED
Energy efficiency 100+ Lumen/Watt (note: This is the Lume advertised for Watt, that is not always correct. Explanation below). 100+ Lumen/Watt e constantly improves
Durability Fragile - has moving parts, glass bulbs and filaments Sturdy - it does not have electrodes or filaments, resistant to shock and vibration
Vita Gives 15,000 a 25,000 ore More than 50,000 ore (many have evaluated more than 100,000 ore)
amortization Expenses in light Moderately high The nominal life (estimated) loses 30% of the light. LEDs last much longer, but the light will continue to decline over time.
Tolerance to cold – 4.4 °C – 1.1 ° C (snapshot)
Performance It requires time to heating 5-10 minutes, creates light in all directions Lights instantly, flicker, cERSONAL to create targeted light and omnidirectional light
temperature chromatic few options (gives 3000 a 5000 Kelvin) multiple options ( gives 2700 a 6500 Kelvin)
color rendering Gives 5 a 93 SHOUT On average 80 a 95 SHOUT
Dimmable? No In much
warranty Usually from 1 a 2 anni Typically 5 anni
Cost Reduced initial costs, but It requires regular repair and replacement of the reactor Initial cost high but virtually no maintenance expense
 

HDI… as indicated in the table, the energy efficiency section, it is not always possible to advertise a nominal value of lumens per watt (Lm / W) relatively to a lamp. This is because there is no standardization in the labeling process, therefore some manufacturers may refer to an average value of Lm / W, while others take into account the Lm / W iniziale. The problem of making a purchase decision based on the initial assessment is that the number may decrease over time and other factors can also reduce the efficiency of the lamp.

Eg, while most of the HID seem extremely efficient, not all of their lumens are actually out of the lamp, since some of the reflected lights are trapped inside or behind the protective covers. Furthermore, the efficiency also decreases with the cold or following the use of ineffective reactors. Furthermore, after 8.000 hours of use, most HID lamps loses about 20% their lumens per Watt while the LEDs will still work almost 100%.

The fundamental point is that, as HID they can advertise with a value of 100 Lm / W, in fact most come just 60 Lm / W.

Solution

In this comparison, LEDs turn out to be winners and from as many as four important points of view: efficiency, lifespan, durability and reduced maintenance. however, There are some marginal cases where an HID is still considered a smart choice. Eg, devices HID are preferable if you opt for temporary lighting at low cost, for extremely high temperature applications or if you want to match the reactors and the existing equipment still in good condition.

In conclusion, LED technology is advancing rapidly and its advantages justify, in most applications, the higher costs than HID lighting.

The LED technology is efficient application in the agricultural-production sector.

In particular, much in the cultivation of vegetables, as in that of cannabis, It is scientifically proven as the LED lighting, by their chromatic variations, impact positively on seed growth, as well as, certainly not trivial, enable a considerable energy saving in the plant cultivation. The intensity of the light, and of course the density and variety of plants, It is a determining factor for crop yield. As it is shown by studies conducted by the University of Wageningen, in the Netherlands, in recent years there has been a considerable increase in indoor cultivation techniques, first of all the greenhouse cultivation. In closed environments the illumination provided to the plants is a fundamental aspect for the purposes of crop productivity.

The LED illumination enables an optimal solution for both the cushioning of plant costs, how to maximize efficiency.

Fonte: LED vs HID

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