LED group buy - Ends December 10th - WICKED DEALS

[Milad]

Now everyone is going to be scared to run theirs at 1000mA to check it out! Well I don't think any other LED looks like the XP-E expect the XP-G and the XP-C. The XP-G only comes in white, the XP-C does come in royal blue but they would burn at 700mA. So I don't think they mixed up the LEDs (hopefully). How are you measuring your current?

[nlreefguy]

Mine are running perfect - all 20 of them! And the light they throw off is amazing. I replaced a 250 W MH (on a 50 gallon 36" long tank) with 30 LEDs and I think I have more light now than i did before!

[eli@fijireefrock.com]

Originally Posted by nlreefguy

Mine are running perfect - all 20 of them! And the light they throw off is amazing. I replaced a 250 W MH (on a 50 gallon 36" long tank) with 30 LEDs and I think I have more light now than i did before!

do you have them running on 1000Ma or 700Ma?
thanx

[nlreefguy]

oh sorry, 1000 mA all the way. No issues whatsoever.

[eli@fijireefrock.com]

i have done few more tests.
the 1st test burnt the royal blue.
the last test was fine with no burnt led everything seems with no problem.
the reason for the shorting led of the 1st test is because i used 3 XPG and 3 XPE all in one series.
last test witch worked well i used 6 XPG in a series and no problem.
another one i rigged 6 XPE in a series separate buckpuck with no problem too.
i am happy with the results because i am planning to place an order tomorrow for the drivers.
all in all i only managed to burn 3 XPE royal blue.

[GMGQ]

Hmm, this is puzzling... Because I'm doing a mini build where I want to use one driver to drive

4 x XP-G (3.0v)
4 x XP-E (3.4v)

The driver will output a constant 700mA.

I found this quote from a site:

Originally Posted by http://www.kpsec.freeuk.com/components/led.htm

"If the LEDs require slightly different voltages only the lowest voltage LED will light and it may be destroyed by the larger current flowing through it."

So that's making me weary of wiring up different LEDs in series now... Should I put a resistor before the XP-E??

Or should I wire the 4 x XP-G in series, the 4 x XP-E in series, then wiring the two strings in parallel?

Milad?

Originally Posted by elias

i have done few more tests.
the 1st test burnt the royal blue.
the last test was fine with no burnt led everything seems with no problem.
the reason for the shorting led of the 1st test is because i used 3 XPG and 3 XPE all in one series.
last test witch worked well i used 6 XPG in a series and no problem.
another one i rigged 6 XPE in a series separate buckpuck with no problem too.
i am happy with the results because i am planning to place an order tomorrow for the drivers.
all in all i only managed to burn 3 XPE royal blue.

[mseepman]

Doing large series strings using those Thomas Research drivers is dangerous. Unless you are an electrician, I wouldn't even suggest it. Keep the strings small in series or do parallel with resistors and fuses.