Emisar D1S Oslon Black flat mod 340k+cd

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djozz
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luminarium iaculator wrote:
led4power wrote:

Djozz showed in his luxmeters tests how huge variation between various luxmeters can be, so all BLF numbers are questionable, at least until we (BLF) find or make “BLF luxmeter”. Only then comparisons would make sense. How hard is to accurately measure light can be seen from tolerance given by LED manufacturers – 6-7% is common number, and they have multi-million $/€ equipment.


 

I am in for BLF luxmeter special edition… They can be calibrated by you for example Thumbs Up


We first have to find an affordable luxmeter that has an acceptable spectrum sensitivity accuracy, before even considering doing the special edition calibration thing.
That cheap Tasi meter could have been a candidate until I found out that they sell cheaped-out versions of the same luxmeters now that will certainly not be good enough.
luminarium iaculator
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I vote for that UNI-T UT383. Maye it ain’t most accurate one but it is easy to use especially when I need to mount it on ceiling lol (I only do that when centering reflector lights).

But yes.
It is good idea for someone willing to take group buy. I think that you are right man for that job Djozz… Some budget light meter with consistent but maybe not so accurate results which will be calibrated by you to certain acceptable values. But it needs to stay in budget segment.

djozz
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I know that I qualify for this, but not the man with the will and spare time to do it.

And I think the Uni-T luxmeter is only good enough if not only checked for one calibration but checked for several different colour temperatures and CRI.

luminarium iaculator
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It really does not have to perfect imho… I know you scientist guys are perfectionist but if we’ll have one unique calibrated BLF meter that can give same results to any BLF member we will be able to know if we made something right or not in certain builds, and especially in situations when we mode same type of light with same emitter.

Even if it will give somewhat wrong values to certain color temperature or cri. For example someone could calibrate it to lets say new osram something emitter(and only that calibration could be enough?) while other data can be compensated through proper test of future BLF budget light meter to lets say your mobilux meter. So then we’ll know how much % to add or take from certain color temperature and cri value?

Crucial in this story is that it should give same results to anyone.

To bad that no one is in mood for something like BLF light meter group buy. Hope one day someone will start it. I am sure he will have around 50-100 of interested guys?

luminarium iaculator
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mikelights

Emisar D1S 340 kcd is some respective results which means that with new “osram white” it should have at least 10-15% more performance. So your 340 kcd is in fact 380 kcd.

I like Emisar(look, performance and everything) but I refuse to buy something that does not have rear switch. Not for my purposes. Hope that Hank will have rear switch in future thrower lights.

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djozz wrote:
luminarium iaculator wrote:
led4power wrote:

Djozz showed in his luxmeters tests how huge variation between various luxmeters can be, so all BLF numbers are questionable, at least until we (BLF) find or make "BLF luxmeter". Only then comparisons would make sense. How hard is to accurately measure light can be seen from tolerance given by LED manufacturers - 6-7% is common number, and they have multi-million $/€ equipment.

 

I am in for BLF luxmeter special edition... They can be calibrated by you for example :THUMBS-UP:
We first have to find an affordable luxmeter that has an acceptable spectrum sensitivity accuracy, before even considering doing the special edition calibration thing. That cheap Tasi meter could have been a candidate until I found out that they sell cheaped-out versions of the same luxmeters now that will certainly not be good enough.

I was thinking more like design it from 0 (electronic stuff) and use case of one of the existing luxmeters as host, a real DIY luxmeter, better than all those Chinese junk.

Most important thing is sensor and I think 2€ sensor like OPT3007 could be good enough choice, spectral response looks pretty close to human eye response.

Absolute accuracy is not really as important as RELATIVE accuracy when we compare BLF numbers.

And I would really like to have 7-seg LED display instead of LCD, maybe it's just me, but kcd measurements are done in dark by most people,so I would like to see those numbers from some distance and in dark.

 

djozz
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The Opt3007 has a better spectral response than even most medium priced luxmeters so I would be all for such a project. The other challenging physical design consideration to make it a proper luxmeter is how to make a diffusor with a correct cosinus response, but that one is even not very important for our use because with throw measurements all the light comes in at virtually zero degrees.

I vote for no housing at all, just a circuit board with everything mounted, including a battery carrier to power the thing. Possibly simple copier paper as diffusor on top of the sensor.

One thing, I know squat of electronics, who can make this thing?

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Actually after a little bit of brainstorming I think alu case like this would be perfect (with holes for display etc.). Sensor would be separate unit and with 3.5mm-like jack or similar.

Electronic design should not be problem. I would like to stay away from Chinese in production, they would immediately start to "tweak" design to save few cents.

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If you can make it than why not? I mean if we would get good luxmeter at budget price?

That box seems to have place for battery. In fact i used such boxes in my diy night vision and FPV builds. They work ok in protecting small electronics.

Lexel
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after the first ptototype failed due to PCB bug I can now finally announce I got my 22mm D1S Linear FET driver for white flats running

first Prototype 20mm small LDO and MCU did not work out

2. Prototype of 22mm with D1S specifications works

luminarium iaculator
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Expected production date Lexel? BTW you are very smart guy Thumbs Up

Paradise
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that looks great! very useful for the black flats around here.

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