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My Self made LED - KinoFlo Select style


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#1 Chanon Wangtrirat

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Posted 07 February 2018 - 04:05 AM

Hi! guys. I'm again on Lighting topic. 

 

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Some of you might have read my post http://www.cinematog...862#entry427134

 

That one was really old and now decommission for upgrade and refurbish with some exciting new feature that I got.

 

I've made LED called : XineLED Apollo for evaluating LED to be use instead of Fluorescent in my arsenal.

 

This one made from home depot softpanel LED troffer which you can. find in various size.

 

 

 

Here is what I wonder to have

 

- High CRI over 90-95

- Color Tunable

- High brightness

- Battery Powered

- Large Aperture

- Smart Function

- No flicker dimming

 

This have to be replace all LEDs inside the unit to new one which denser and have RGBW Strip.

 

Nominal Power consumption : 280W

 

 

 

 

Last time I posted the topic. I said, It would have to use CRI 95 LED for White LED to have best color rendition. WRONG!!!!!

 

This is due to red primary which use in CRI 90-95 LEDs is really Red spectrum opposed to Orange-Red in normal YAG CRI 80 LEDs.

 

Here's  measurement I take with i1Pro2 Spectrophotometer with CRI CQS and various standard results.

 

This is CRI 95 WarmWhite + CRI 86 Warmwhite (for Spectral continuity) + RGB 

 

CRI 86 LED + RGB 95CRI.png

 

This is Normal Panasonic 3W Warmwhite LED CRI 85 + RGB. The result is really clear.

 

27503707_10215889887031059_5667448339176

 

Main things need to go right with RGBW

 

- White LED need to have continuous spectrum but being cut off at some spectral for RGB to add later

- Blue LED in RGB LED have to fairly deep blue. Likely to cause Metamerism for both eyes and Camera sensor, Royal blue 460-470nm for optimum color rendition and light source match.

- Controlling software need to be totally HSL color manage solution (for professional equipment)

 

SKINTONE test with Standard Sony photo

Tungsten 3200K mode

 

27629452_10215889953352717_8222101526658

 

I'm pleasedwith how it's render skintone.

 

27912516_10215889954432744_5189376432593

 

27628567_10215889954912756_5545249544347

CONTROLLING : 

 

I use ESP32 for controlling the brightness in each channels, It's amazingly cheap but yet fully functional for me.

Control using Blynk platform on Mobile phone. As I have no skill in writing code on OLED/LCD menu interface.

DRAWBACK : Blynk application needs to connect to the internet. which make me have to turn on hotspot on phone when I use outside range of my home wifi.

 

Here's current functions I've already written the code.

 

White Mode (K)

- 3200

- 4100

- 5000

- 5500

- 6000

- 6500

- 7500 

- 8500

- 10000

This is preset being calibrated with both Spectrometer and camera sensor. (Canon, Sony)

 

Effect lighting 

- Fire

- Police

- Lightning

- Party fade 

 

RGBW custom mode 

 

All being control on smartphone.

 

 

 

It also have small OELD Screen for status message.

 

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27788817_10215889950512646_1736919844954

 

 

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Many feature will be add later as I find out how to write the code ( i'm so noob on this.)

 

Video just test on Hue mode

 

 

 

 

UPDATE Coming !


Edited by Chanon Wangtrirat, 07 February 2018 - 04:14 AM.

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#2 Phil Rhodes

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Posted 07 February 2018 - 05:01 AM

Nice work.

 

How are you allowing the ESP to control the brightness?


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#3 Chanon Wangtrirat

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Posted 07 February 2018 - 10:04 AM

Nice work.
 
How are you allowing the ESP to control the brightness?


I used ledc function on esp32 which can be easily coded.

Blynk virtual wire just send variable from slider on smartphone.


ledcSetup(3, 12000, 12); // 12 kHz PWM, 12-bit resolution

And then

BLYNK_WRITE(V0)
{
PWM_LED1 = param.asInt();
ledcWrite(1, PWM_LED1);
}


This is example from others but my code runs at 13 bit resolution (8192 level) to control brightness.
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#4 Phil Rhodes

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Posted 07 February 2018 - 10:05 AM

Aha, PWM. I assume the frequency is pretty high to ensure no flicker?

 

P


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#5 Chanon Wangtrirat

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Posted 07 February 2018 - 10:13 AM

Aha, PWM. I assume the frequency is pretty high to ensure no flicker?
 
P


Yes, more than 20000Hz. There is sightly banding occur in >1/400 shutter speed but most of the time I shot just 1/50-1/100 so it performed flawless even dim down to 5%
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