LED. the term “LED” stands for “Light Emitting Diode”, or “light emitting diode”.LEDs are increasingly being used in the lighting field to replace some conventional light sources. In the latest models for professional use the light output is around 120 lumens per watt, at a minimum.
Their use in underwater scope makes them a respectable source with its efficiency 90 lumens per watt. By comparison just think that an incandescent lamp has a luminous efficiency of about 20 lumens per watt while a halogen lamp of 25-35 lumens per watt and a linear fluorescent up to 104 lumens per watt. Their lighting is that limit their emission characteristics and duration are strongly influenced by the characteristics of power and dissipation. In fact, LEDs need stable current and dissipation and contrary to other light sources the heat is generated in the rear of the illuminator.
Keep in mind though that the market today can also be found the latest LED color temperature from 3,200 to 6,500-7,000 degrees Kelvin. Their light output and chromatic is remarkable and allow good autonomy.
P er a major feature article on LED technology and for responding to frequently asked questions on the subject of underwater lighting, I recommend reading an interesting article written by Massimo Carello (Our site) Underwater lamps only German dealer in Italy, FWT-Schulz (Our site) which offers a useful guide to choosing and buying a dive light: Our site.
A comparison of the various types of lamps
Parlando of luminous efficiency of various types of lamps, in any case it is very difficult to compare the performance of different light sources, because this is affected by many parameters. The amount of Watts is not meaningful, because Watts indicate the power consumption, but not the light yield.
Every lighting system has its own light output (Watts employees/light emitted), called “efficiency report”.
To give an example of efficiency report we can say that the normal incandescent lamp makes about 2% light on power consumption, with the 3-4%, and let us go up to the halogen to HID LEDs or 15% and 18% are between (typical values).
Then, with the same power (Watts), incandescent bulbs emit light in smaller quantities than the other, while the HID bulbs and LEDs are those that emit more light.
If it is true that low power consumption LED and HID lamps emit larger amounts of light, it is also true that the light emitted is different “color”.
To give an idea of what “color” we can say that a bar of iron does not emit light, but if it is heated its molecules will begin to emit electromagnetic waves. These early are not visible to the human eye (infrared) but gradually increases the temperature the waves emitted will increase their frequency in the visible spectrum between infrared and ultraviolet.
This is to say that the light emitted is not the same color but every source can emit light at a certain temperature in degrees Kelvin. We like the two extremes, that an infrared light to 1,800 degrees Kelvin (low temperature) and that the ultraviolet to about 16,000 kelvins (high temperature).
Paradoxically psychologically feel the light closer to red as “warmer”, although his temperature is “cold” and “cold” light that we perceive as near ultraviolet, even if its temperature is “hot”.
Incandescent lamps and halogen torches are warm with a temperature around 2,000/3,000 degrees Kelvin; instead HID lamps and LEDs emit light over 4,000/5,000 kelvins.