can't seem to find SAE either... got some BBA..

Since lighting is part of planted tank's necessity, i'll post my DIY lighting plans here..

Item purchased so far:




1W White LED 70 Lm - 20 pcs




3W Blue LED 90 Lm - 20 pcs




30 degrees LED lense - 20 pcs



15 degrees LED lense - 10 pcs



LED heat sink - 40 pcs



24V power supply - 4.3 A


Some circuits i planned ealier to run 10 pcs of 10W LED:





the circuits need to be modified to run newly planned LEDs.


Total damage was RM300.. will be doin the acrylic casing soon... once the parts arrived..

thanks to pakutekan for his ideas... Sorry buddy i had to buy the items first without u... let me put it all together and see if it works as intended. then i'll help u get ur stuff..

thanks bro..bought all the stuff from ebay la.. except the power supply.

To most of ur surprise ebay is pretty reliable.. just have to pick a seller that has almost 100% positive ratings.. and has a large amount of sale... and most ebayers prefer paypal secure payment(paypal.com). paypal even offers maney back guarantee..

but u need to register with paypal.. unfortunately paypal only registers ur credit/debit card for payment transfer. so, it's actually a week process to register ur card with paypal and get it verified..

ebay and amazon has been the no 1 shopping place for me for the past 8 years.. for the first 5 years i was living in the states, i've bought everything online. even my car. lol.. seriously. no joke.. it's much easier in the states. transactions are much secure.

I'm badly in need of SAE.. if someone knows where they are currently being sold or someone are willing to spare some for trade or money, pls do let me know.. i need 3 of them..

thanks.

In parallel it becomes a current divider, in series it's a voltage divider.

make sure the PSU has enought current output to drive the LED in parallel.

to calculate current output, P=VI. Power in watt, V in voltage and I in amps. so, I=P/V

Eg, I=400/12 =33.33 Amps..

U might wanna be careful with the circuitry. A 3 watt led has a driving current of 700mA= 0.7 amps. ur PSU has way more power to run leds make sure u have properly designed the circuit with adequate resistors to limit the current and voltage to avoid frying the LED.

This post has been edited by moe81: Sep 24 2010, 05:28 PM

Nice, since u have a circuit up, it'll be easier to troubleshoot.. what's the power rating on ur PSU? how many watt? from that power u can find the current output..

also, if it's possible. state the LED, driving curent and forward voltage.. if u get it from ebay, check the isting. it muct be stated there...

specs for ur LED:

Power: 10W
Voltage: 10V
Current, I= P/V = 1 Amp

If u have connected the two leds and the PSU parallel to each other, the voltage drop across all component will be 12V. that's bad. prolonged operation in that voltage may compromise ur leds life span. or might just fry it even sooner. so, we need to calculate a equivalent resistor to limit the voltage to 10V max across each led.

For the PSU, if u're using the 12 volt cable only. with the 18A current, u can drive any component up to (P=VxI) (12x18), 216 W max. but u're only gonna drive 2 10W led. that's only 20W. so, again we must limit the current too. from ur led spec the current goin thru each LED must not be more than 1 Amp as opposed 18 Amps..

let me calculate and put up a new circuit for u. so u can drive ur leds safely.. but i'm not sure how damage u have done to ur leds already..

My LED lighting is finally progressing. will update soon.