well it seems all have a light box apart me so …. i have to make one too :bigsmile:
problem is that i do not want to spend to much money and time on this project, so start to look around in my mess that i call office and doing so go in thinking mode …
…. theory is… well lets make it simple. i wanted fast and easy results. this could easy led me in wrong and false results but I try this route nevertheless.
i got not a sphere but a simple box :X (easy and fast—- check )
I got not an super duper multi-output super precisely calibrated expensive power supply, but a simple 10$ driver (easy and fast —check)
I got not a super expensive lightmeter but just the most simple one there is (easy and fast —- check)
well i didn’t think before that all i needed building my light box was there near to me …
for almost an hour all the project was finished:
sorry that i do not have photos during building process but since i thought this will fail to work, i do not make any, but since wanted to play around continue the work
well i got some numbers lets see if they are worth it or are terribly wrong as I was afraid during building.
well curious i go to my crappy pc and since i do not have exel (i just boot from an live disc that i have make some time ago with some pupy OS of some sort …)
opened calc program and start learning how to use it…
after some time i got this:
funny thing it looks OK to me !
lux numbers are as i sow in my lux meter without any converting factor lol i am lucky some time
i see 133 lux in my lux meter , than those mus be 133 lumen hahaha
ok i got Vf till the moment led was of, and i got some extreme numbers just for funn
i think the real Vf maybe can be 0.07 V lower because the way i measure … however here the graph from my experiment :
Output of XML-2 U2 in my super simple setup
Vf on the LED
and since i got some very small numbers here the graph in different scales to see better the values :
somewhere between 2.341V and 2.130 the led stop emitting visible light. on 2.341 V the light was very very soft :
i measure also mu M2 with this numbers : low 35, med 180, hi 240 and and say to my self oh crap this light box is totally worthless :
than i suddenly realize that maybe battery was down. opened measure battery: 3.2V ! lol got an Sony hi-drain in and : ~35. ~300 med , ~740 hi.
as u can imagine smile was back in my face :bigsmile: