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How to choose LED Aquarium Light (part3)

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發表於 2013-12-17 19:49:25 | 顯示全部樓層 |閱讀模式
How to choose LED Aquarium Light (part3) ~ boss reluctant to disclose the secret: color temperature, spectral, color rendering ...





Color is only to convey the human eye (the hearts of) feelings

The color cast iron at different temperatures to produce the "color temperature" is represented (as shown), rather than real source temperature. Will be issued when the object is heated different colors of light, that is to say from physics "blackbody radiation". But it can not show a "light" connotation. Analogy, is to see a piece of paper, I can only judge is yellowish white or bluish white, but can not determine the composition of white paper; another point of view, is the same degree of white paper, it may be can be composed of many different recipes, so there will be a white toilet paper, as well as white drawing paper, photocopy paper white, or even photo paper white, the same color, but the quality is very different!! In other words, the color temperature of the light source can only express appearance, but can not represent the connotation of the light source.





Spectrum (Spectrum) documented "light" formula consisting of (wavelength; wavelength)
"Light" is a form of electromagnetic radiation, Ke Yi into non-visible wavelength or frequency (less than 380nm and 770nm) and visible light (380 ~ 770nm) or other forms of energy, according to the wavelength of visible light can be further divided into a sequence length of red, orange, yellow, green, blue, violet light. In simple terms, each of us is the human eye can see colors, has its own definition of a wavelength; For example :430-475nm between, known as Blu-ray (blue); 400-430nm between, known violet (violet); between 610 ~ 730nm, known as red light (red). And professional VITALUX LED Aquarium Light (Light & Plants), you can more accurately distinguish between different solid color light range (below) of violet, blue and red light: as Ultra Violet (near ultraviolet), Violet (purple), Royal Blue (sapphire), Blue (Blue), Cyan (blue), Red (red), Deep Red (dark red) and Far Red (far-red) and so on!



"Optical spectrum (the spectrum)" simply, is a combination of many different wavelengths, which is composed of different wavelengths formulation. General white LED, inspired by the blue chips to yellow-green phosphors (red or yellow-green phosphors), the spectra are basically similar. Only in the deployment of different color temperatures, such as warm white (2600K) will be fine-tuning in the middle of yellow-green powder (gluten Cadogan point), even adding a little red phosphors, phosphor and this ratio, the decision of the spectrum shape, but also determines the color temperature of the LED, and even affect the overall color rendering. Put another way, the same color temperature possible models A high CRI (> 85), B section CRI (67), these two spectra will look different (see below)!! Then put it another way, The same or similar spectral shapes may also be present in different color temperatures (ex. 5000K ~ 7000K color temperature of these two, but there may be the same group of the same phosphor LED output ratio among)!! other words, although we Further to measure the spectrum of light with a recipe, but there are further space to explore this formula is not appropriate (the ratio close to the sun), or is not valid to use (in line with the needs of bio-optical power).





CRI fidelity interpretation of artificial light
CRI (Color Rendering Index; CRI) is used to measure the fidelity with the real indicators of artificial light under the sun. In simple terms, if an apple color in the sun, we set to 100, and in the color of artificial light apples only 85 (or Ra85), that is, the color fidelity compared to artificial light in the sunlight fidelity of only 85%. For LED lamps for instance, from (below) VITALUX sea Lifein series of reports can be seen in the overall optical lighting color temperature of about 4800K, the equivalent of a light-colored middle of the day, but from a general low CRI LED, VITALUX Haili Seoul lamps color rendering (Ra) up to about 87, which is true with respect to the index under the sun!! Furthermore, not only is the spectrum of the monotony of the traditional white LED spectrum, but added the photosynthesis of plants The deep red band (660nm) ~ simple conclusion is to say, the general commercial plant 5000K lamp, this may not exist 660nm deep red band, CRI may only reach Ra65 or Ra75 level. So when the water museum boss just told you: aquarium lights look to the color temperature indicated value ... on the grass or keep fit SPS-LPS ...?!! , You can ask him to say: This light spectrum long-sawed?! Which band wavelength needed for plant growth?! Which plants need some color band wavelength?! Enriched fish which need some color band wavelength?! Reptile of the sun which lights need some band wavelength?! LPS-SPS different fluorescent protein (GFP, RFP, YFP ...) What are the needs of each band wavelength to excite the fluorescent & brightening?! You sell the spectrum of this LED lights right?! Ra worth?! ~ Hang!!
But perhaps there really will answer your boss yo!! -----> (This I know!! Professional plumbing boss - and pro level players!!)



. PS1 aquarists custom ratio of optical measurement chart: color temperature 8300K, Ra values ​​up to 93 is considered a very professional sea prince ~!!!
But if coupled with a few deep red 660nm & 380nm UVA, spectrum will be more perfect friends!

. PS2 professional from sea prince with a group of LED lamps ~ CCT = 8000K, Ra = 90, Spectrum and more: Amber / Red / Deep Red
Guess next month when a new version of Super VITALUX chlorophyll f edition (740nm Plus) listed ~ Sea Prince will it order a TripleBlue (A) + TripleBlue (B) + TripleRed (B)


LED lamps and more diverse collection of light-colored text, please refer to the fish book:http://www.fishfishbook.org/index.php?topic=225.92


On a " how to choose LED Aquarium Light (2nd type) - get rid of the myth (LED lamp manufacturers do not want to disclose the truth)!! ............ "



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