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角顏色問題 [複製鏈接]

nickdo

論壇元老

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21^#

發表於 2013-6-14 16:51:34 |只看該作者

本帖最後由 nickdo 於 2013-6-14 16:57 編輯

chihim 發表於 2013-6-14 12:31
擋uv系因為太強，但唔會100% 無uv，珊瑚出色關唔關uv事，好肯定講句。。真系關羅

珊瑚本身唔中意u ...

首先謝謝你的分享, 不過我睇文章個作者O既資歷好似只係一個店主... 而且佢講得相當 general.

Stan and Debbie established and ran a reputable fish collecting business in Hawai'i for 10 years before relocating to Kinston, NC. They now manage the fish department at Animal Jungle pet store.

之前睇過 Dana Riddle 的 How to Make Corals Colorful 系列及 Coral Coloration 系列文章, 得知400nm~500nm波長光是珊瑚最重要的激發顯色波長範圍, 基於其以大量實驗室數據及生物學論文為跟據, 以論文方式撰寫文章, 其可信性及可靠度比其他一般文章為高... 大家不仿看看.

http://www.advancedaquarist.com/2009/1/aafeature1
http://www.advancedaquarist.com/2009/2/aafeature1
http://www.advancedaquarist.com/2009/4/aafeature1

該作者對 UV 的研究 Playing With Poison - Ultraviolet Radiation
http://www.advancedaquarist.com/2004/8/aafeature
首先實驗指出 UVR 係對珊瑚有害的.

OK - My Lamps Are Generating UVR. How Do I Get Rid of It?
There are many choices for UV filters and, even better, are widely available and relatively inexpensive. Your local hardware store probably has sheet acrylic material (sold as 'safety' glazing). Any glazing marked as 'UV Protective' will work. Common brand names are Lexan, Lexan Solar and Lucite. Thickness isn't critical (1/8" or 3/32" is fine), but orientation is - some acrylics are coated with UVR-absorbing compounds only on one side (the directions will tell you which). Avoid hardware store window glass - if the glass is green when viewed edge-wise, don't use it (3/16" 'green' window glazing transmits 75% UV-A and 3% UV-B). If in doubt, use the 'UV card' mentioned above to check the material in full sunlight.

What Are the Trade-offs of UVR Shielding?
Expect the acrylic material to attenuate photosynthetic active radiation (PAR) by 6 to 14% (depending upon brand of acrylic). As a general rule, acrylic tends to absorb most energy < 390 nm, but also attenuates violet and blue wavelengths slightly more than other visible wavelengths. This weakening is not apparent to the human eye (mine anyway) and only a meter can gage the weakening effect. Maintenance is a bit higher, since salt spray will have to be cleaned off the shield (but is much easier than scraping dried salts off a metal halide lamp).

Doesn't UVR Promote Coloration in Corals?
There is a lot of work to be done in this area, and some interesting coloration shifts have been noted in corals exposed to UVR. But it has not been determined if the coloration is due to UVR or simply an slight increase in PAR (especially violet and blue wavelengths) due to the lamp's UV shield being removed.

(注意Color Shifts係指變色, 可以係好可以係壞(即係綠色角變黃都係color shifts, acan食太光走色都係叫color shifts, 而且係不可逆), 唔係指普通的出色[pigment emission]). 當然 color shift 都有機可以 shift 到靚色O既...

Vivid fluorescent/reflective coral coloration, in many cases, is possible without exposure to UVR.

之前都講過, 400~500nm是最基本的.

我比較想知如果做實驗 UV Shielded/without Shielded 既結果. 咁就知 DIY LED 夠竟要唔要加 UV LED啦.

仲有一篇文係為LED而寫的, 睇下揾唔揾到先.

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chihim

論壇元老

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22^#

發表於 2013-6-14 16:54:47 |只看該作者

未必但唔一定都幾shield and spear 播

者系人唔食飯但食粥都可以生存一樣者

唔講缸，講個海，就一定關uv 事

按我造訪海水珊瑚拍賣群

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chihim

論壇元老

Rank: 7 Rank: 7 Rank: 7

23^#

發表於 2013-6-14 17:03:00 |只看該作者

唔記得講，我唔系用硇仔ga

我用led加t5

按我造訪海水珊瑚拍賣群

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nickdo

論壇元老

Rank: 7 Rank: 7 Rank: 7

24^#

發表於 2013-6-14 17:12:10 |只看該作者

chihim 發表於 2013-6-14 16:54
未必但唔一定都幾shield and spear 播

者系人唔食飯但食粥都可以生存一樣者

個研究係表示,
1. 400nm~500nm 已經係最重要的 pigment excitation spectrum.
2. UV 可能有作用, 但非必要條件, 並且 UV 會有走色現象(可好可壞)

所以我話未必關事, 只係 base on 1.

所以話香港人真係唔夠 open mind, 好多野, 大家都係分享下, 就算係科學研究都會被推返啦. 係台灣甚至大陸, 魚友的討論風氣都係分享. 唔係你咬我我咬你咁, 抽稱大家有咩謂呢?? 調轉我係你的態度, 係咪又要抽稱下你唔知 MH 要 shield 呢...? 唉... 我既分享就到呢度啦...