4 Cree Light !!

ledebuhr1 · Jan 2, 2008

Thanks for the info. I would like to know how this compaires to the MX Power 3Cree in brightness.
I hate to order one, as Im sure they will have a model out that uses the Q5.

lightfet · Jan 2, 2008

I can't resist the temptation, ordered 1 too.

LoneRebel · Jan 3, 2008

MountainPenguin:Any chance you can see how it does on 18650's? Also can you try and light up a backyard or neighborhood or something? Those hotspots on the wall don't scream I'm a monster to me

Thanks,

BTW When did you order? Just curious how much longer I have to wait for mine to arrive.

mountainpenguin · Jan 3, 2008

Ok this arrived today in the post.
fist thoughts are:
It looks quite nice. The threads feel ok.
The wiring looks a ok. It is wired as 2 parallel sets of 2 in series. i.e. 2 sets of 2 led in series.
On Primary cr123 it all looks ok but on rcr123 the extra length is too much and the cells are crushed to the extent they stop working (ultrafire cells)! After removing a section from the top of the tube though they fit fine.
This thing is very bright and throws well. Was lighting up houses over 100m away despite the street lights.
Took some pics http://picasaweb.google.com/f00b4rr/Cree4
there are 2 wall shots @~3m. The wall is painted light blue sorry. The comparison light is an ultrafire fmr1 with a fresh cr123.
The reflector / emitters are not symmetrical! which is odd.
I haven't had chance to see how long it runs for yet.
The cells are 16.3v unloaded and it draws 0.48 amps I think

mountainpenguin · Jan 3, 2008

LoneRebel said:
MountainPenguin:Any chance you can see how it does on 18650's? Also can you try and light up a backyard or neighborhood or something? Those hotspots on the wall don't scream I'm a monster to me

Thanks,

BTW When did you order? Just curious how much longer I have to wait for mine to arrive.

ordered when the thread appeared here.
If i go off to visiti a mine this weekend will take pics there as well as doing a bit of painting

J.D. · Jan 3, 2008

looking forward to see your pics

Stereodude · Jan 3, 2008

ledebuhr1 said:
The only thing I dont like about ordering from DX is that it takes so long. Why cant they ship this stuff from China to a warehouse in the US and then ship it to our houses.

Simple, it gets them around paying an import duty on the lights, and shipping from China to the US is probably less than UPS ground or USPS from inside the US.

Steel and Light · Jan 4, 2008

Initial impressions:

Got my Romisen 4 Cree from DX a couple of days ago. It seems brighter than my 3 Cree light but to my eyes not tremendously so. The build quality seems very good. You can also take out a section and run it on 3 batteries instead of 4. The sheath is so-so.

For some reason, the guys at the office say that it feels better in the hand than the 3 Cree light - better balanced?

I made the mistake of accidentally shining it in my eyes. Had a headache for an hour. Ouch!

I'm impressed so far, a keeper.

Grzess · Jan 4, 2008

Can anyone measure current draw from battery?
I hope this light will not :poof:

like ultrafire.

J.D. · Jan 4, 2008

mountainpenguin said:
The cells are 16.3v unloaded and it draws 0.48 amps I think

16,3v x 0.46 amps are 7,498 Watts.
lets say the boards effectiveness is 80% 0,8x7,498 watt around 6 watts
(i doubt it would be 80%)
so there are 6 watts for 4 leds, means 1,5w/led
in this calculation each led is powered with 1,5w/3.6v = 0.41A

hm i hope your measurement wasn´t on high...
if so, there is a lot of modification potential :grin2:

cheers
J.D.

fa__ · Jan 4, 2008

Measured on mine (received yesterday)
On high mode:
970 mA with 2* 18650 at 8.05V -> 7.8W
520 mA with 4* rcr123a at 16.49 v -> 8.57W

My eyes can't see any difference between 18650 and rcr123

Trax · Jan 4, 2008

Hello,

I am new to led flashlights and only own a fenix l2d, is there any chance you could post a photo of the 4x cree compared to a single fenix?

Grzess · Jan 4, 2008

~0.45A at each emiter, not much.
So the output is probaly comparable to MX power 3-cree.
Now i have dillema which to chose...:thinking:

fa__ · Jan 4, 2008

mountainpenguin said:
Ok this arrived today in the post.
fist thoughts are:
It looks quite nice. The threads feel ok.
The wiring looks a ok. It is wired as 2 parallel sets of 2 in series. i.e. 2 sets of 2 led in series.
On Primary cr123 it all looks ok but on rcr123 the extra length is too much and the cells are crushed to the extent they stop working (ultrafire cells)! After removing a section from the top of the tube though they fit fine.
This thing is very bright and throws well. Was lighting up houses over 100m away despite the street lights.
Took some pics http://picasaweb.google.com/f00b4rr/Cree4
there are 2 wall shots @~3m. The wall is painted light blue sorry. The comparison light is an ultrafire fmr1 with a fresh cr123.
The reflector / emitters are not symmetrical! which is odd.
I haven't had chance to see how long it runs for yet.
The cells are 16.3v unloaded and it draws 0.48 amps I think

Was it hard to unscrew the head ? Mine seems to be glued

W-c.Scenario · Jan 4, 2008

Trax said:
Hello,

I am new to led flashlights and only own a fenix l2d, is there any chance you could post a photo of the 4x cree compared to a single fenix?

here you go:kewlpics:

Without extender (3 x rcr123a)

Trax · Jan 4, 2008

Thanks for the photos any chance of a photo of the beam pattern side by side against a white background or comparison outside in the dark?

W-c.Scenario · Jan 4, 2008

Trax said:
Thanks for the photos any chance of a photo of the beam pattern side by side against a white background or comparison outside in the dark?

Might give it a try but I doubt my mobile phone cam would do it any justice, lets hope others with better cams will post some bemshots.

ledebuhr1 · Jan 4, 2008

Im sure Romisen will come out with a version that uses Q5 LED's soon, or the even brighter R series.

J.D. · Jan 4, 2008

ledebuhr1 said:
Im sure Romisen will come out with a version that uses Q5 LED's soon, or the even brighter R series.

According to Romisen there are Q4´s used - i don´t think you will see the difference between Q4 and Q5....

-walle- · Jan 4, 2008

What options are available if you wanted to drive the led's at a higher current? Would it possible to direct drive them as they are? Maybe with a small resistor?

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