Dr Meter Lx1330b How To Use

Dr. meter LX1330B Lux meter - a Await Inside.

I have ane of the "Dr. meter" LX1330B Lux meters that I bought earlier I knew improve….
I got reading the mail from djozz :
http://budgetlightforum.com/node/62763

And that led me down the rabbit hole to the earlier tests.
Which betoken that my meter basically sucks. Oh Well….

I wanted to go something to make a cheap light sphere. Or in my case a foam libation.
Instead of plugging in a abiding to convert lux to lumens, I decided to try to get some sort of direct reading in lumens by putting various filters in front of the sensor.
I actually only wanted to become something to use for run-fourth dimension tests. I need something that is sort of linear beyond the various lumen outputs to make information technology useful.

I have mixed results. Using lights of semi-known values – Information technology seems OK in the heart values say 300 to 1000 ish lumens. Information technology reads too high in the lower values and too low in the higher values.

Subsequently reading the djozz inspired threads, I got out my screwdriver to see what there is to see.

The chief lath has two adjustment points. What to do with them I oasis't a inkling.

The flip side only has the switch points and connection to the brandish.

The sensor is hidden under the expected filter. Looks fairly centered on my meter.

It looks awfully familiar…

Here is the OSRAM BPW34 Pin photodiode side by side to the Dr. meter sensor.

This is the sensor fabricated famous in Terry Oregon's sensor thread for use in measuring PWM:
http://budgetlightforum.com/node/61254
And my build using it based on Terry's thread:
http://budgetlightforum.com/node/66813

I wonder if information technology's possible to use one of these to make a "lux/lumen/something?" meter that could be used to get accurate measurements beyond a larger calibration without having to hope for a "proficient version" Tasi from China or spending $$ on an actual good quality meter.

I have been playing with the sensor using the PICO Logging software and looking at the voltages generated by various lights.
There seems to be a sweetness spot, and just like this Dr. meter, Low lumens don't seem to be in accordance with the middle values, and the high end is not showing as big a change in voltage as expected.

I as well tried a simple solar PV prison cell.

Information technology is very responsive in the lower lumen range. At the brighter finish it shows reduced response to brightness change.
I've been playing with using a series of filters in front of the PV cell to try to bring the brighter lights downwardly into the sweet zone (as it were).

Existence able to use the data logging software and some sort of sensor is miles ahead of shooting time lapse of the lux meter and pulling out time/lux values past hand.

I haven't reached any conclusions yet. I'1000 only sort of rambling on and fishing for suggestions.

BTW – What are yous folks using as a sensor for your run fourth dimension plots?

All the best,
Jeff