Seoul P7 volt

[nelson49]

Hello
I know i can run all 3 x Seoul P7 led and they will have 2800 mA and series connection for the LEDs
and they will give me max 2700 lumen an use 12,6 volt. But how low can i run them in volt and give me 1200 - 1500 Lumen how much mA is that ?
I will like to shift them to low and hight Lumen for a Dive led canister light
I will use this PowerLine Constant Current Power Supply (2800mA, 30V) from : http://www.led-tech.de/en/LED-Contr...wer-Supply--2800mA,-30V--LT-1291_118_119.html
And use NiMH battery batteri 12 x D 1.2 volt 8000 mah / will be 14.4 volt + 8000 maH in Series
Is this battery ok ? : http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=5046089
Can i put i Resistor in series connection with the PowerLine Constant Current Power Supply and shift them to Low mA and max 2800 mA ?
sorry four my Englisk i am from Denmark

 

[knabsol]

Hej!
12 of those batteries gives you about 14,4V and the driver drops about 1v so it´s a little bit on the short side. I dont know how it will act when batteries are running out.

And the simplest way to shift between high and low birghtness I think is to use 2 constant current regulators, and run two P7s on one of them and then the other on the other one, switching it on gets you all three leds.
I´m not sure how the current regs work but it looks like it´s no fancy switching so probably it will burn away the excess.
I dont know how complicated or how much work you want to put down but another solution is to use a switching regulator and set the low bright and high bright by PWM.

 

[nelson49]

ok then 14 x D 1,2 volt. (is the Battery from Rs shop ok to use ? )
can i use a 1400mA, 30V Constant to switching four my 3 x P7 ?

 

[bhvm]

Putting just 3 LEDs direct drive 12v is very dangerous.
You are inviting the death knell for LEDs.

Look at SSC p4 Data sheets.
3.7v is achieved at just 900mA.
3.00 V Pulls 350mA (personally verified)
3.05V Pulls 430mA... See how sensitive they are.

If you are feeding 'em with more than 4V, you'd instantly kill them all.