XML and XML2 de-dome color temperature changes

[dthrckt]

@texaspyro

The Defiant went from 78.4 kcd with the domed XML2 to 160 kcd with the de-domed XML2… over twice the throw (measured at 2 meters)

These Defiants were mod’d with 3 amp Qlite drivers, sinkpad, and coated lenses.

huh. well, i’m more confident in my numbers now!

[FlashPilot]

@texaspyro

The Defiant went from 78.4 kcd with the domed XML2 to 160 kcd with the de-domed XML2… over twice the throw (measured at 2 meters)

These Defiants were mod’d with 3 amp Qlite drivers, sinkpad, and coated lenses.

How is the qlite working out with 3 x C cells? Im guessing it runs well on 3.9V or less?

[texaspyro]

@FlashPilot

How is the qlite working out with 3 x C cells? Im guessing it runs well on 3.9V or less?

It’s OK, but the C cells can’t hold the current for long. The Qlite/XML2 drops out of regulation around 3.6V

[texaspyro]

Some beam shots. Domed on the left, de-domed on the right:

[AlexGT]

Nice! What equipment did you use to measure the kelvin temperature? Would it be a safe bet to assume a drop of about 1,500k give or take when dedoming a led?

So a dedome of a 0A or 0B tint led (8,000K) has the potential of turning into a 2B or 2C tint?

Thanks!

[texaspyro]

@AlexGT

Nice! What equipment did you use to measure the kelvin temperature? Would it be a safe bet to assume a drop of about 1,500k give or take when dedoming a led?

I haven’t dedomed enough stuff to be able to predict what the outcome will be…

For measuring color temp I used this:

Any interest in a LED/Battery analyzer device?

I am building a device for analyzing batteries, LEDs, drivers, flashlights. As planned it would have: 2 × 30 amp hall effect current sensors (< 2 milliohm burden resistance) 2 x type K thermocouples (good to 1000 degrees C!) Battery and LED voltage monitoring (up to say 50 volts) LVC cutoff FET for the battery Light sensor input (digital and analog sensors supported, 50K-100K lux, integrating sphere supported) RS232 link to computer / monitoring, graphi…

It has a Taos TCS3210 color sensor chip. I calculate the color temp from the color channel readings.

[FlashPilot]

Thanks for the beam shot comparisons. Very useful!

[Hikelite]

@dthrckt

@texaspyro

I de-domed an XML2 T6 3C LED. The original color temp was 4820K, a rather nice neutral white. The de-domed color temp is 3068K… standard halogen bulb warm white. Light output went from 865 lumens to 700 lumens. I think I’ll mount it in a Defiant 3C… I used Coleman fuel to de-dome the LED. I removed the dome became it became damaged with the LED/heatsink toppled over face down onto a table when it was running at 3 amps. Burned a hole in the table and buggered the dome.

great info! I put a dedomed xml2 t6 3c on 20mm copper sinkpad in a 7g5v2. I’m surprised how much I like the tint, now that I know the actual color temp. I also did some resistance fixes, but was very surprised when throw went from ~85kcd (stock, collimator) to ~180kcd, although I suspect I need to measure from farther away. ~13ft probably isn’t adequate for that light…

What exactly do you mean by resistance fixes?

[djozz]

thanks for the first actual quantitative measurement of colour temperature change upon dedoming that I have ever heard of

[Lothar]

@texaspyro

Some beam shots. Domed on the left, de-domed on the right:

Thanx for the shots. What was the domed tint and de-domed tint here?

[NightCrawl]

So you went from 3C to something in the area of 7B. Thats a huge change.

[texaspyro]

@Lothar

Thanx for the shots. What was the domed tint and de-domed tint here?

Domed 4820K went to de-domed 3068K

[moderator007]

So what do you think if I used a XM-L2 1C 6000k, de-domed would it end up around 4500k? Looking to do the same mod with the Defiant.
http://www.cnqualitygoods.com/goods.php?id=1880
Thanks for the great technical info Texaspyro, very useful information.

[texaspyro]

@moderator007

So what do you think if I used a XM-L2 1C 6000k, de-domed would it end up around 4500k?

I dunno… one way to find out…

[Lothar]

@texaspyro

@Lothar

Thanx for the shots. What was the domed tint and de-domed tint here?

Domed 4820K went to de-domed 3068K

Wow, I did not think that photo was the 3C before and after de-dome
The before dedome looks almost bluish, more like a 1A/1C. Must be the auto balance of the camera, or did you take the photo with fixed daylight white balance?

[moderator007]

@texaspyro

@moderator007

So what do you think if I used a XM-L2 1C 6000k, de-domed would it end up around 4500k?

I dunno… one way to find out…

Are you implying that you may test it. :bigsmile:

[Hikelite]

@moderator007

So what do you think if I used a XM-L2 1C 6000k, de-domed would it end up around 4500k?

1C is can be anywhere from 6100K to 6500K, not 6000K.

[texaspyro]

@Lothar

The before dedome looks almost bluish, more like a 1A/1C. Must be the auto balance of the camera, or did you take the photo with fixed daylight white balance?

Those garage doors are a medium grey color, the pillar between them is a very light tan color. Camera settings were whatever it wants…

[texaspyro]

@moderator007

Are you implying that you may test it. :bigsmile:

I don’t have a 6000K XML2 to try. I have a 6300K XML taking a bath right now…

[moderator007]

@Hikelite

@moderator007

So what do you think if I used a XM-L2 1C 6000k, de-domed would it end up around 4500k?

1C is can be anywhere from 6100K to 6500K, not 6000K.

That can’t be right because cnqualitygoods has I listed as 6000k to 6500k. Lol
I was just speaking in general, but you are correct with a 1C tint.