水草情迷

48" 3白 12V 10W LED 用12V 4A牛來推, LED好光 but 好熱,
after 5 minute 火牛 stop working and spoil
any ideal?? is the connection wrong or the 火牛 problem???????

+12V-------- | --------|---------|
O O O
-12V---------|---------|---------|

http://item.taobao.com/item.htm?id=2182459629 ,
240W12V15A火牛 can go for how many 12V 10W LED??
240W12V20A火牛 can go for how many 12V 10W LED??

緊係啦你有三個問題出現。
1.)12V10W真係要加粒電阻嫁，唔係一定會壞燈(係遲早問題)。
2.)LED一定要安在平面的物料上，重一定要中間有電腦用果啲散熱膏貼實。 睇你個燈架弧形應該唔得。
3.)你的火牛線連接LED太幼啦好危險，你冇摸過條線發熱嗎？

最後我明明有PM比你接線和加電阻嫁。

_________________
24"x12"x14"
Atman CF-800
HAILEA 130A
Lighting: LED 3:00pm-10:30pm
CO2: 1 bubble/sec 24 Hours
ADA Amazonia I

我都用緊這樣工業牛12V4.5A推3粒10W LED完全冇問題。
記得牛接LED電線要夠力，小心小心。

_________________
24"x12"x14"
Atman CF-800
HAILEA 130A
Lighting: LED 3:00pm-10:30pm
CO2: 1 bubble/sec 24 Hours
ADA Amazonia I

thanks xrkennethchu,
1) if i added 2ohm resister means the light only run with 8volt, i run with 9 volt before it seem verry dim, not bright enought.
2) that one is aluminium light reflector, and it flat type, only the casing is 弧形.
3) yes, i also feel that its hot , will change to bigger one..do you think the normal power cord 13A 40wire ok to use?

what do you think if i change the power supply to
http://item.taobao.com/item.htm?id=1499478931 set the output to 10V
can it suport 2x (48" 3白 12V 10W LED)

connection A or connection B is the correction..

可用1mm單枝電線因硬線好用啲。
這只火牛可以 support 6粒LED
Yes Connection B

_________________
24"x12"x14"
Atman CF-800
HAILEA 130A
Lighting: LED 3:00pm-10:30pm
CO2: 1 bubble/sec 24 Hours
ADA Amazonia I

可能火牛輸出12V電壓或2ohm電阻有誤差所以暗咗。
可以試吓1-1.5ohm應該會光啲，只要唔係12V直接LED就可以。

_________________
24"x12"x14"
Atman CF-800
HAILEA 130A
Lighting: LED 3:00pm-10:30pm
CO2: 1 bubble/sec 24 Hours
ADA Amazonia I

你好!
1) 10WLED最好供电在9V至10V之间,LED会够光同不太热.因为卖LED的老板告诉我.
2) 电路图中加了电阻而不够光是没有加电解电容所致,在LED正同负之间加一个4700UF16V电容应该可以解决这个问题.

10w led 會燒燶水草, 3w 好夠用了, 除非你玩海水+超深??