I was thinking it would use a regular brightness ramp, but there would be an additional factor to set the tint blend. Probably an 8-bit blend value, so 256 steps of color control. If the brightness was set to, perhaps, PWM=100/255, the tint value would determine how much of that 100 goes on the warm channel vs how much goes on the cool channel. So, for example…
Tint=0 would be entirely warm (100/0), 3000K.
Tint=255 would be entirely cool (0/100), 5000K.
Tint=128 would be 50/50, 4000K.
Tint=83 would be 68/32, ~3640K.
It would take perhaps 4 seconds to change tint from one end to the other.
The easiest way to add it would be to map tint change to “click, click, hold” since that’s not really used yet, so it would work during pretty much any mode — anything except “off”, lockout, and momentary, IIRC. And perhaps it could also have an automatic mode where tint is determined by brightness, like maybe if tint=0, it would be automatic.
The lantern’s design unfortunately makes thermal regulation not work, since the sensor (tiny85 built-in) is thermally isolated from the emitters. However, this should provide extra room to add other features… like tint ramping.
If the tint goes from 2700K to 5000K, more people and more situations will have their favorite tint, with 254 tints in between there are also more than enough tints between 3000 and 4000K.
This looks too good to pass up!
Please put me on the list for two.
I’d prefer something in the 3000k to 4000k.
Two LH351D 3000k 90CRI emitters and two LH351D 4000k 90CRI emitters with tint adjust/ramping seems perfect to me!
I would really like for the tint to ramp between 2700k and 5000k in the way TK described. Some of you guys need to remember that there are others in this world besides yourself and 5000k is still considered Neutral White and is going to be preferable for a huge percentage of people. Not only that, but as djozz said, 4000k is still possible, so you’re not losing anything by it.
Please add me for a second light. If we can get this in warm white, adjustable or fixed, I’ll definitely purchase two. So hard to find warm led flashlights/lanterns.
The new Zanflare T1 18650 lantern has tint ramping from 2700k to 6500k. And brightness ramping with memory. It remembers both the tint and brightness. The button on top is a touch sensor. About the size of a Fenix CL25R
That would be fine also. What would you suggest for high CRI emitters?
I’m usually a 4000k to 5000k kind of guy, but for a lantern I thought 3000k might be nice.
The 351D is one of the latest and greatest high CRI emitters and happens to come in 3000k and 4000k.
I also envisioned the emitters spaced around the globe with something like the Q8 LED board and you might want emitters that appear similar (not too different in color).
I’m more of a fan of the 5000K CCT, and in a lantern I guess I would like the 4000K ~ 5000K range, but with variable CCT, I’d be down for much warmer emitters, as long as I still have the option to go to 5000K