Chanon Wangtrirat Posted February 7, 2018 Share Posted February 7, 2018 (edited) Hi! guys. I'm again on Lighting topic. Some of you might have read my post http://www.cinematography.com/index.php?showtopic=66862&do=findComment&comment=427134 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 February 7, 2018 by Chanon Wangtrirat Link to comment Share on other sites More sharing options...
Premium Member Phil Rhodes Posted February 7, 2018 Premium Member Share Posted February 7, 2018 Nice work. How are you allowing the ESP to control the brightness? Link to comment Share on other sites More sharing options...
Chanon Wangtrirat Posted February 7, 2018 Author Share Posted February 7, 2018 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. Link to comment Share on other sites More sharing options...
Premium Member Phil Rhodes Posted February 7, 2018 Premium Member Share Posted February 7, 2018 Aha, PWM. I assume the frequency is pretty high to ensure no flicker? P Link to comment Share on other sites More sharing options...
Chanon Wangtrirat Posted February 7, 2018 Author Share Posted February 7, 2018 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% Link to comment Share on other sites More sharing options...
Bruno Michelon Fenner Posted March 1, 2018 Share Posted March 1, 2018 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! Link to comment Share on other sites More sharing options...
Chanon Wangtrirat Posted March 10, 2018 Author Share Posted March 10, 2018 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. Link to comment Share on other sites More sharing options...
AJ Young Posted March 11, 2018 Share Posted March 11, 2018 Very well done! Is this just a personal project or are you looking to expand into a business? Link to comment Share on other sites More sharing options...
Bruno Michelon Fenner Posted March 12, 2018 Share Posted March 12, 2018 Why did you choose a Warm White led strip over a Cool White led? Link to comment Share on other sites More sharing options...
Chanon Wangtrirat Posted March 13, 2018 Author Share Posted March 13, 2018 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. Link to comment Share on other sites More sharing options...
Chanon Wangtrirat Posted March 13, 2018 Author Share Posted March 13, 2018 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. Link to comment Share on other sites More sharing options...
greg bates Posted March 20, 2018 Share Posted March 20, 2018 That project is sick. Do you mind sharing which LED strips you purchased? Link to comment Share on other sites More sharing options...
Adam Ogden Posted March 20, 2018 Share Posted March 20, 2018 How are you powering it? Link to comment Share on other sites More sharing options...
Chanon Wangtrirat Posted March 24, 2018 Author Share Posted March 24, 2018 How are you powering it? I used Meanwell 24V 400W Power Supply. Sightly under voltage to 22.7V lower the heat stress on panel. Link to comment Share on other sites More sharing options...
Chanon Wangtrirat Posted March 24, 2018 Author Share Posted March 24, 2018 (edited) 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 March 24, 2018 by Chanon Wangtrirat Link to comment Share on other sites More sharing options...
Adam Ogden Posted December 3, 2018 Share Posted December 3, 2018 Do you have any updates on this project? Link to comment Share on other sites More sharing options...
Chanon Wangtrirat Posted December 18, 2018 Author Share Posted December 18, 2018 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. Link to comment Share on other sites More sharing options...
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