16 replies to this topic

[Chanon Wangtrirat]

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

 

 

 

 

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 

 

 

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

 

 

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

 

 

I'm pleasedwith how it's render skintone.

 

 

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.

 

 

 

 

 

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.

[Phil Rhodes]

Nice work.

 

How are you allowing the ESP to control the brightness?

[Chanon Wangtrirat]

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.

[Phil Rhodes]

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

 

P

[Chanon Wangtrirat]

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%

[Bruno Michelon Fenner]

Amazing work, man.

 

I did something similar to you, but i used a RGB, WW and CW led strip to achieve the disered color temperature.

 

How did you find the numbers for each color temperature? Trial and error with a spectrometer?

 

I planning in build a larger scale of my first led panel, but this time in a smarter way.

 

Thanks man!

[Chanon Wangtrirat]

Amazing work, man.

 

I did something similar to you, but i used a RGB, WW and CW led strip to achieve the disered color temperature.

 

How did you find the numbers for each color temperature? Trial and error with a spectrometer?

 

I planning in build a larger scale of my first led panel, but this time in a smarter way.

 

Thanks man!

 

 

Yes, Trial and error. 

 

Firstly, I use i1Pro2 spectrometer to measure the CRI CQS above. but later I borrow Sekonic C-700 for better evaluation. 

[AJ Young]

Very well done! Is this just a personal project or are you looking to expand into a business?

[Bruno Michelon Fenner]

Why did you choose a Warm White led strip over a Cool White led? 

[Chanon Wangtrirat]

Why did you choose a Warm White led strip over a Cool White led? 

 

The Phosphor on warm white has stronger yellow-orange-red distribution which easily compliment by add blue spectrum by Blue LED and add more red by Red LED 

 

The Blue chip in white LED have so much power in itself opposed to red which is lower energy than blue. Red LEDs are also inefficient compared to blue.

[Chanon Wangtrirat]

Very well done! Is this just a personal project or are you looking to expand into a business?

 

Maybe but not for now as I have to test it myself first.

[greg bates]

That project is sick.  Do you mind sharing which LED strips you purchased?

[Adam Ogden]

How are you powering it?

[Chanon Wangtrirat]

How are you powering it?

 

 

I used Meanwell 24V 400W Power Supply. Sightly under voltage to 22.7V lower the heat stress on panel.

[Chanon Wangtrirat]

The latest test pave for second panel I will made. Experiment for decision of strip.

This is the most accurate combination I've done.

RGB + White 6000K CRI 95 + Warm White 2850K CRI95. The most expensive one also.

 

Achieve CRI Ra 96.7  

 

Calibrated using Sekonic C-700 with MG+-0 @5500K

 

Edited by Chanon Wangtrirat, 24 March 2018 - 05:16 PM.

[Adam Ogden]

Do you have any updates on this project?

[Chanon Wangtrirat]

Do you have any updates on this project?

The Original apollo is aging. There is some problem about connections between LED strips. Because it's diy project.

There are new panels I made have same formfactor like litegear litemat. Which use aluminum sheet as structure have really clean surface for strip and adhesive to stick on. Use 5 colors RGB+CCT in 1 chip. Produced clean white from 2800K to 10000K same as before but has more consistant in brightness.

Photo of my friend lit using Kino Flo KF55 on the right and new Apollo LT on the left.
All using same control as before on Blynk with now running local server on NANOPI duo in powerbank. Not scared of no internet connection anymore.

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