Tri Cree XP-E2 RB/RB/W vs B/B/W vs RB/B/W

[Vezon]

I am going to be doing my first ever install on an Obi-TPM hilt. I know that generally people use the B/B/W configuration for the blue color, but I've read some stuff about the Royal Blue LEDs having a really nice color. You obviously lose 'brightness' when you use the Royal Blue over the Blue because of the deepness of the color. For anyone who might have a RB/RB/W setup, is it considerably more dim than a B/B/W setup? I also haven't read anything about anyone doing it, but if you ran a RB/B/W setup, would that add 'brightness' to the blade while retaining some of the deeper color, or would the RB get drowned out by the B?

[Forgetful Jedi Knight]

Welcome to the Forums.

The answer is It depends ™ , it mostly depends on how you see things. Normally rB isn't THAT much darker than a regular blue. I am about to do an install soon that used rB/B/G. Mostly, it just averages out the two different shades.

[Canister]

I look forward to the comparison :)

[NanoRex]

I have a B/rB/W LED sitting in my saber parts box. I could maybe do a comparison between either die or both, but I don't have anything to properly drive them with at the moment (except for maybe my CF driver).

[girot]

I could probably rig something up for testing purposes and do a video. Turn each one on individually (blue, then royal blue) and then together. I could also boot up the Prizm with cyan (blue+green) for a final comparison.

[NanoRex]

I could probably rig something up for testing purposes and do a video. Turn each one on individually (blue, then royal blue) and then together. I could also boot up the Prizm with cyan (blue+green) for a final comparison.

That would be helpful. Make sure to do it over a white background so it shows an accurate colour :)

[IkarosReve]

Hey guys this might be a little off topic but I just got B/rB/W Tri Cree.
I was doing the resistor calculation based off of using a 3.7V supply and running them at 1000mA

For Royal Blue the Forward Voltage is 3.47V so that gives me 0.23 ohm 0.23W
For Blue the Forward Voltage is 3.41V so that gives me 0.29 ohm 0.29W

These numbers seem ridiculously low. Did I do something wrong because I see some people using 1 ohm resistors for their builds.

Would wiring 0.47ohm 0.5W resistors directly after each positive lead from the dies be OK?

[girot]

Hey guys this might be a little off topic but I just got B/rB/W Tri Cree.
I was doing the resistor calculation based off of using a 3.7V supply and running them at 1000mA

For Royal Blue the Forward Voltage is 3.47V so that gives me 0.23 ohm 0.23W
For Blue the Forward Voltage is 3.41V so that gives me 0.29 ohm 0.29W

These numbers seem ridiculously low. Did I do something wrong because I see some people using 1 ohm resistors for their builds.

Would wiring 0.47ohm 0.5W resistors directly after each positive lead from the dies be OK?

Yup those will work fine. I'm doing the same thing.

[IkarosReve]

Yup those will work fine. I'm doing the same thing.

Thanks for the confirmation. I didn't want to put a 1 ohm resistor and have the LED be super dim. Also didn't want the LED dies to burn up on me after turning it on a few times lol

[jamiemp]

Welcome to the Forums.

The answer is It depends ™ , it mostly depends on how you see things. Normally rB isn't THAT much darker than a regular blue. I am about to do an install soon that used rB/B/G. Mostly, it just averages out the two different shades.

Hi! Did you ever test/post this rB/B/G combo? I'm super interested to see how this came out.

[Forgetful Jedi Knight]

Hi! Did you ever test/post this rB/B/G combo? I'm super interested to see how this came out.

Yes, it was installed into the build. As I said earlier, it's just a very slight difference in color.

[girot]

14267

Blue/Blue
Blue/Royal Blue
Royal Blue

[rlobrecht]

Good comparison. What battery/resistor combo did you use on each?

[jbkuma]

Is the difference in the blades a good representation of the naked eye, or is it more due to the camera?

[girot]

Due to the brightness of the LEDs the camera tends to wash out. To the naked eye all three are distinctly different colors.

The saber on the left is a short 1" thick-walled blade (no diffuser film).
The saber in the middle is 7/8th thick-walled blade (w/ diffuser film).
The saber on the right is a 1" thick-walled blade (no diffuser film).

[girot]

Good comparison. What battery/resistor combo did you use on each?

All three use 3.7v 18650 batteries and 0.5ohm/3w resistors.

[rlobrecht]

All three use 3.7v 18650 batteries and 0.5ohm/3w resistors.

Thanks.

[jamiemp]

All three use 3.7v 18650 batteries and 0.5ohm/3w resistors.
Curious as to why the 0.5/3W resistor instead of the 0.47/0.5W?

[Silver Serpent]

Probably that's all that he had available at the time. There's no significant difference between the two, other than wattage and physical size.