Remote phosphor led lights color stability

cpc

cpc

Well-known member
I am pondering an investment in new daylight balanced lights and I am curious how decent are remote phosphor led lamps (cineo, area 48, hexolux? are there any others?) in terms of color stability. My consern is related to GB and RGB led backlight display tech color stabilization time. A typical wide-gamut LED display supposedly needs around 30 minutes to stabilize color after power on.
Anyone tested color stabilization time with any RP led lamps?
 
“A typical wide-gamut LED display supposedly needs around 30 minutes to stabilize color after power on.“
I can imagine a CRT (tube) monitor may need a little “warming“ up time, but a LED backlit display should fire up to the correct and stable color temperature immediately. Unless the backlit brightness is changed which may introduce a wee bit, almost unoticeable shift in color, as many led emitters do exhibit a slight color rendering change when ramped up or down. The phosphor panel design makes use of ultra blue leds in the 450nm range of light wavelength and are extremely stable in their color(deep blue) rendition and the phosphor panel by itself does not , im my opinion , introduce color casts or off color effects. The RP panels are in different grades of yellow to deep yellow depending on the color temperature desired. The deeper hues for the warmer tints. You may want to check out the Chromalit series of RP panels tech spec sheet to see some comparison of color shifts and accuracy. I may be wrong in my assumptions as I can only go by what I read and there are differences from source to source. Don't forget that RP panels are usually/most likely in the wide area dispersion pattern that may be impossible to obtain a hard light or narrowing capability.
 
CRTs should be more unstable, indeed. But I do remember EIZO boasting the 7 minutes color stabilization time of their LED displays as an achievement. Should be easy to find in their marketing materials. Of course display tech is admittedly much more complicated. Still, would be nice to hear from RP lights users. Easy to test even without a color meter. (For example, shoot a raw picture of a grey card every minute or so after power on, then color picker balance in something like Camera Raw or Lightroom will give color temp and G-M tint).

As for softness, I am mostly tempted by Hexolux fresnels. They don't seem to explicitly mention RP, but the tech description is similar. If their photometrics are accurate, light output from a 150w source is comparable to a 200w HMI fresnel. And I would happily live without the hassle of managing HMI lamps (or fluo lamps, for that matter) if color and output is comparable. :)

Thanks for the heads up, I had a look but Chromalit papers don't appear to mention stability.
 
It is fantastic. Great color rendition and a very small LED source allowing hard shadows if you want them. Light output is high, in fact looking at their 20" softbox on full power is painful.

The daylight is 5200k instead of 5600k. I would prefer 5600k but it wouldn't be a deal breaker. The main issue for me right now is the lack of large soft boxes or the ability to easily mount 3rd party modifiers. However they are working to fix this. Having 1/4" mounting spots all over the unit will make many things possible.

The light is also dead silent even on full power!
 
Usually augmenting natural light, and mostly in close-ups; either bounced up close, or through a frame. I would generally use a 200w or a 400w hmi for this. And occasionally I'd bounce a few near windows under heavy overcast to raise light levels a bit without disturbing the natural feel of the location; small pars of fresnels or whatever is available. I do like having the option for hard light though.
I don't really use softboxes much, so the lack of accessories isn't bothering me. As long as there is the option to stick a filter frame in front of the lens and behind the barn doors I am happy. I figure there is no need for scrims with the tilt-shift lens and the dimming capability. 5200K is also fine by me.
 
Anyone tried Mole-Richardson Quantum LED fresnels?
Price is decent (compared to RP leds) and they claim hmi-like quality and CRI 90 (for the daylight variant, that is). Plus, there is a 400w fresnel.
 
cpc said:
Usually augmenting natural light, and mostly in close-ups; either bounced up close, or through a frame. I would generally use a 200w or a 400w hmi for this. And occasionally I'd bounce a few near windows under heavy overcast to raise light levels a bit without disturbing the natural feel of the location; small pars of fresnels or whatever is available. I do like having the option for hard light though.
I don't really use softboxes much, so the lack of accessories isn't bothering me. As long as there is the option to stick a filter frame in front of the lens and behind the barn doors I am happy. I figure there is no need for scrims with the tilt-shift lens and the dimming capability. 5200K is also fine by me.
Click to expand...

Hexolux might work well for you if the price is okay. They also have a battery option which I would be really tempted to go with. NAB is just around the corner so maybe we will see more
 
cpc said:
Anyone tried Mole-Richardson Quantum LED fresnels?
Price is decent (compared to RP leds) and they claim hmi-like quality and CRI 90 (for the daylight variant, that is). Plus, there is a 400w fresnel.
Click to expand...

Hard to find reviews on these and I don't see them for rent at my usual places either. The 400w would be pretty great and the price is somewhat reasonable for the light output.
 
And Adorama also have Nila and Cineo for rent.
But I have a suspicion they won't rent across the Atlantic. ;)
 
The Area 48 is lovely, i sold off some kino kit to swap. The colour quality is stunning and the output is perhaps a little more than a Kino Diva 400 but much softer. Plus it can run off Vlocks which is a complete bonus (nice portable soft daylight fill outside...). The only downs (so far) are that it's surprisingly heavy (well built, but for portable a bit lighter would have been nice) and it's quite picky about what batteries it likes (because of the amount of draw needed).

But i'm very happy so far with it

cheers
Paul
 
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