Has anyone tryed this new led yet? 370 lumens@350 ma ,3.4 v

[LeMoel]

http://www.ledsupply.com/creemce.php

[xwingband]

That's the Cree cousin to the Seoul P7. I suggested it in the other thread.

It should be easier to focus due to a smaller dome (I looked a while a go and thought the dome would be a squeeze but should fit with our normal optics). It's also more controlable since you can link the dies however you feel like.

[Sairon]

this might be a better option, seeing as it only needs 700 ma insted of 3000 ma.

[Kal El Rah]

I am confused about the voltage that you listed. The info on the site states:

# CREEMCE-W370, White Cree MC-E Star Features: 370 lm @ 350mA
# 700mA - Max Drive Current
# 12.8Vf - Typ. Forward Voltage @ 350mA
# 13.6Vf - Typ. Forward Voltage @ 700mA
# 6500K - Typ. Color Temperature
# 4-Chip In Series Circuit
# Cree Part# MCE4WT-A2-0000-000K02

so where did you get the 3.4v?

[Jay-gon Jinn]

I am confused about the voltage that you listed. The info on the site states:

# CREEMCE-W370, White Cree MC-E Star Features: 370 lm @ 350mA
# 700mA - Max Drive Current
# 12.8Vf - Typ. Forward Voltage @ 350mA
# 13.6Vf - Typ. Forward Voltage @ 700mA
# 6500K - Typ. Color Temperature
# 4-Chip In Series Circuit
# Cree Part# MCE4WT-A2-0000-000K02

so where did you get the 3.4v?
3.4 volts is the required vf @ 700ma for each of the 4 dies individually...he read the chart wrong.

[Kal El Rah]

Thanx Jay,

That's what I figured, and of coarse it is a series circuit for the LEDs which in turn would require the full 12+ volts to run, or am I wrong?

[Jay-gon Jinn]

Thanx Jay,

That's what I figured, and of coarse it is a series circuit for the LEDs which in turn would require the full 12+ volts to run, or am I wrong?
X-wing would be the one to know for sure, but I think you're correct, they'd have to wired in series to get the full lumens out of it.

[Novastar]

It may depend on how you wire it. Series and parallel are still "in full effect" if an LED has several dies on the same star...

...just like if you "chained together" a bunch of Luxeon III stars with several wires. You could do this in || or in = , heheheh

[Kal El Rah]

After reading the PDF for it it does say "Individually addressable LEDs", so Nova, you are correct in stating that they can be II or =.

[Novastar]

I learned this from X, so... there ya go. Thank him! :)

[Sairon]

same led, cheaper price.http://www.dealextreme.com/details.dx/sku.16145

[xwingband]

People need to pay attention to that is paralleled though.

The emitters can be paired however you want, hence the 8 legs. I would always recommend series over parallel, though a compromise would be 2 and 2. That's 6-7V and 1.4A.

[Marsupial]

I'd be curious and try those 2x2 ones... do we have valid sources for stars with this configurability? DX isn't there for configuration on these, it seems.

[Sairon]

Xwing, whats the difference betwen the parallel and series? If I'm just runing the led of a board does it matter, if it does which do you think is better series or parallel? yeah I know I sound like a noob whats it to you.

[xwingband]

You could look it up...

Think of current like a hose with water. Parallel would be a "Y" connection. You'd need to up the current to get the same out of both hoses.

Using the sama analogy, series is "daisy chaining" (+'s to -'s). The voltage is added that way. In the analogies it's like having the same rate flow but needing a higher pressure.

I always would recommend series. It makes sure the same amperage is going to each LED. Parallel there can be minute differences in the dies that cause one to consume more current than the other. It's not unsafe or anything, but series is preferred for that. Parallel is easier to get without loads of batteries for a high voltage though.

[DJMoonbass]

so is the cree or P4 brighter?

[vargose]

The Cree MC-E is brighter. The P4 is easier to wire, is cheaper, and has lower power requirements.

My P4 looks great. Someday I may use a Cree MC-E, but for now the P4 is good enough for me.

[Sairon]

the mc-e is is 370 the p4 is 240

the mce is 34 bucks, the p4 is 8 bucks.

it all depends on what you want.

[Darth_DevilGuy]

also the P4 has a VF of 3.5 as opposed to 12 something, which would fry any soundboard available I think...

[DJMoonbass]

i think ill stick with a P4 for now. cree sounds a little too advanced....

[Darth Demens]

Between the 12V requirement and the $30 price tag, I don't see myself swapping out my Lux3s for it anytime soon.

[DJMoonbass]

well you should consider swapping for a P4. talk about amazing. I am just waiting for TCSS to get more whites in.:mad: