好可怕的LED - 水族
By Faithe
at 2011-04-10T06:18
at 2011-04-10T06:18
Table of Contents
※ 引述《ggxbb (歐死大)》之銘言:
: 嘖嘖 led的照度太威了
: 國外的水族館把HQI換成LED燈具的改變
: 480瓦的LED可以取代6700瓦的HQI
: 而且亮度大增 會不會太可怕了...
: http://tinyurl.com/3wwb3f2
: 只是LED燈具未來不知道會不會有降價的一天
: 現階段實在是很貴 囧
其實LED會被用來推廣綠色能源也不是沒有道理
製程越來越進步, 一些5W的高亮度LED的照度已經可以跟30W普通燈泡or
以上瓦數的燈泡抗衡了...而這個差距就是省電的差異
至於LED燈具貴不貴, 除了LED本身品質好壞, 跟驅動器也有很大的差別
一般便宜的LED燈, 你拆開來看其實裡面只是一些電阻二極體做成的穩壓
電路而已, 那是相當糟糕的電路, 不過便宜就是了= =
事實上LED是電流驅動的一個元件, 他的I-V CURVE是二極體的曲線(發光二極體)
微小的電壓變化會造成電流上巨大的變化, 而這條曲線會隨著溫度, 使用時間而飄移
,所以就算按照LED的SPEC去做分壓電阻去穩壓, 事實上LED可能都在超流的狀態下使用
壽命跟功能就會降低....就很容易壞掉,所以一個好的LED燈具是需要穩流IC去提供穩定
電流給他的, 而加上這個電路自然是不會太便宜 囧
而以上討論是以單路電流驅動而言, 更高瓦數的LED蠻多是使用低瓦數LED去串並聯
成一個矩陣, 一但用到並聯, 就還要考慮各路電流平衡問題, 如果直接驅動, 很有可
能因為LED的誤差而造成各路電流不同而讓每排的亮度有些微差異, 當然LED的匹配
也是很重要, 不過這是另一個故事...簡單來說, 用到並聯就需要使用多通道驅動
的LED DRIVER IC來控制每路小誤差的電流, 而這又更貴了....
另一方面是散熱, 有人會好奇...LED好像是冷光, 怎麼會需要散熱??
是的, 高瓦數的LED是需要散熱的, 他很燙....一般常見的子彈型LED
驅動電流大多20mA, 所以不感覺燙, 而高瓦數LED電流 350mA~1A是很常見的
而溫度的變化也會影響他的I-V CURVE, 曲線會飄移, 所以更高瓦數的LED除了
需要好的散熱外, 也需要好的IC電路去穩流, 否則一下就燒掉了...而我相信
好的散熱跟好的IC穩流電路, 加上一顆品質好的LED....是需要$$$$$$$$$的..
不過很多人比較不能接受的是LED的光很刺眼, 照出來的顏色相當冷感, 沒有
一般傳統燈泡的溫暖感覺 XD, 不過我記得這已經有開始在改進, 也有一些
更高級的電路是控制三個顏色LED的比例去調光, 不過這就扯遠了...
以上只是單純討論貴這個部分, 適不適用在水族上, 光譜適不適合我就
不曉得了 XD
--
--
: 嘖嘖 led的照度太威了
: 國外的水族館把HQI換成LED燈具的改變
: 480瓦的LED可以取代6700瓦的HQI
: 而且亮度大增 會不會太可怕了...
: http://tinyurl.com/3wwb3f2
: 只是LED燈具未來不知道會不會有降價的一天
: 現階段實在是很貴 囧
其實LED會被用來推廣綠色能源也不是沒有道理
製程越來越進步, 一些5W的高亮度LED的照度已經可以跟30W普通燈泡or
以上瓦數的燈泡抗衡了...而這個差距就是省電的差異
至於LED燈具貴不貴, 除了LED本身品質好壞, 跟驅動器也有很大的差別
一般便宜的LED燈, 你拆開來看其實裡面只是一些電阻二極體做成的穩壓
電路而已, 那是相當糟糕的電路, 不過便宜就是了= =
事實上LED是電流驅動的一個元件, 他的I-V CURVE是二極體的曲線(發光二極體)
微小的電壓變化會造成電流上巨大的變化, 而這條曲線會隨著溫度, 使用時間而飄移
,所以就算按照LED的SPEC去做分壓電阻去穩壓, 事實上LED可能都在超流的狀態下使用
壽命跟功能就會降低....就很容易壞掉,所以一個好的LED燈具是需要穩流IC去提供穩定
電流給他的, 而加上這個電路自然是不會太便宜 囧
而以上討論是以單路電流驅動而言, 更高瓦數的LED蠻多是使用低瓦數LED去串並聯
成一個矩陣, 一但用到並聯, 就還要考慮各路電流平衡問題, 如果直接驅動, 很有可
能因為LED的誤差而造成各路電流不同而讓每排的亮度有些微差異, 當然LED的匹配
也是很重要, 不過這是另一個故事...簡單來說, 用到並聯就需要使用多通道驅動
的LED DRIVER IC來控制每路小誤差的電流, 而這又更貴了....
另一方面是散熱, 有人會好奇...LED好像是冷光, 怎麼會需要散熱??
是的, 高瓦數的LED是需要散熱的, 他很燙....一般常見的子彈型LED
驅動電流大多20mA, 所以不感覺燙, 而高瓦數LED電流 350mA~1A是很常見的
而溫度的變化也會影響他的I-V CURVE, 曲線會飄移, 所以更高瓦數的LED除了
需要好的散熱外, 也需要好的IC電路去穩流, 否則一下就燒掉了...而我相信
好的散熱跟好的IC穩流電路, 加上一顆品質好的LED....是需要$$$$$$$$$的..
不過很多人比較不能接受的是LED的光很刺眼, 照出來的顏色相當冷感, 沒有
一般傳統燈泡的溫暖感覺 XD, 不過我記得這已經有開始在改進, 也有一些
更高級的電路是控制三個顏色LED的比例去調光, 不過這就扯遠了...
以上只是單純討論貴這個部分, 適不適用在水族上, 光譜適不適合我就
不曉得了 XD
--
--
Tags:
水族
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