水草情迷

經常見各位討論老素

k 數同 w 數係兩種唔同o既o野
k 係色溫, 大約即係 光o既顏色.
w 係發出或消耗o既能量.

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Super兄，在以前的文章中，你曾經講過會將一D關於色溫和光譜的問題在這裡發表，幾時有得睇呀？

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咁養草睇W數 定 K 數多D呢? 有冇大W 數既 pl 管 係同 18W pl 管一樣長既呢? 因為我想改大支pl 既火數 , 但又想用返個17' 殼, 同埋18W 既pl 管同大DW 數既 pl 管個插位係咪一樣既呢?

多謝Super兄講解。這是否代表k數大即比較光猛呢？

色溫是黑物在某溫度所發的光之顏色, 如BBQ紅碳之絕對溫度就是其光顏色之色溫, 色溫常用於白光顏色之質素, 如電視出廠調整之白色是9600K.

選光應選光譜, 因同一色溫可由不同頻譜(光)之組合而成, 如電視只由紅綠藍三種光組合而成各種顏色. 比如在同一光度, 種草用紅加綠之黃光會比純黃光好.

Is that the '3-wave length' PL tube emit equal amount ofRed ,Green,Bluelight? So it's pure white? I saw some PL tube in ShamShuiPo (e.g. Toshiba) label '3-band', are they means '3-wave length'?
Now I am using a PML 9W PL light, do U know is it using '3-wave length' PL tube? Since I cannot find any lable on it.
Also is '3-wave length' PL tube better for water grass?

Yes, almost true. 3-band tube with red and blue phosphor and metal (mercury) vapour added, which make red/blue light intensity closer to green light because green phosphor is cheaper and higher efficiency.

There is no pure white since it is only meaningful against human eye, which is not same from people to people. And all know that red/blue bands are useful to plants and Green light only make you can see the green plants.

I don’t know PML tube spec. but you can try to find its CRI (Colour Rendering Index) for reference. Higher CRI (max. 100) means more actual colour you can see on the illuminated object. In other words, more equal colour spectrum it can give out, but of course, also relied on colour response of human eye only.

Hope can help you some