Virence VS35SP36 MCPCB - cost effective (High CRI) General Lighting solution

Don’t forget to add 85% optical efficiency and 95% electrical efficiency in the equation. I always use 85% OE and 95% EE for high end design and 85% OE and 85% EE for normal design. 150lm/watt system efficiency is realistic with 170lm/watt LED level efficiency.

And with such low power density you can put your usual thermal transfer anxiety to sleep. :stuck_out_tongue:

[Clemence]

Clemence, I for one would love to see what you can do for home lighting.

I didn’t forget to take optics and driver into account. 200 lm/W end to end is at the edge of feasibility, depending mostly on how exactly do these LED behave when underdriven. I also tend to use 95% buck driver efficiency but for this light I assumed more efficient optics.
:wink:

And thermals are actually an attention-worthy deal. Mere 5% efficiency drop due to heating up is a big deal.

More on the 200 lm/W…I did the calculations yesterday and several days ago, now I write from memory so I may be off.
Samsung and Everlight do 230 lm/W at 10 mA.
With very low current you need much less diffusion. And the lantern doesn’t harve to be completely glare-free; low-glare may be OK.
So…
230 lm/W base, efficient buck driver, AR coated lightly patterned glass cover. Luminit claims their diffusers to be 95-98% transmissive depending on angle, so probably more like 96% overall. I’ve seen other makers claiming 94% and used that. So 205 lm/W. Now…

  • thermals reduce it
  • light at very wide angle which doesn’t hit the glass is a further tiny reduction
  • some of the light reflected off diffuser and which didn’t hit the glass will be recycled by white head interior or by phosphor

So…as I said, 200 lm/W is at the edge of feasibility, may or may not be doable.
Note that about 20 LEDs give nice about 100 lm when driven at 10 mA each. And 20 MP LEDs doesn’t cost arm and leg.

200lm/watt is definitely attainable these days. My last citylight project requirement was 150lm/watt with 3000K 80 CRI at system level.
Although we got beaten by Hori LED for the price, that was quite a learning process. And that has made me respect mid power LEDs more than before. I used to skip all low and mid power LED every time I browse manufacturer’s website, not anymore.

[Clemence]

Agro and clemence, I like your way of thinking. :slight_smile:
I also appreciate mid power LEDs more and more.

I thought you signed the contract with the City. So you didn’t get it after all?

Unfortunately no. :weary:

Oh no, after all that effort, maybe few hundred hours??, and you got nothing from the City?

Only small orders for mining lamps and handshakes :stuck_out_tongue: . Nothing is wasted, I learnt many things in the process.

[Clemence]

Knowledge and experience is priceless! :beer:

Well now back to work on the 4x4 and/or 3x3 E21A mcpcb and RRT01 mod :smiley: I think the mcpcb would be popular since it would be a direct swap into so many XHP70.2 lights in existence.

:AWRIGHT:

UPDATE 190729: Test Result

100+ watt LED wattage

[Clemence]

Is there any way to have two isolated sets of LED’s on one board? I would like to have adjustible color temperature, so have alternating rows of 5000k LED’s and alternating rows of 3000k LED’s, where all the 5000k can be controlled separately from the 3000k.

No by default. But you probably can do it yourself by scraping the masking and make your own wiring path.

[Clemence]

Hello clemence !

Any plans to bring such packages (more particularily the Optisolis based ones, as tested bu Maukka) in a complete bulb format (E27 based for instance)?

Yeah, I’m thinking to make circular DIY kit for light bulb retrofit. But the problem is in choosing universal sizing for the MCPCB. Would you like to participate in the research?
And one more thing: almost all light bulb’s diffuser are glued to the base. Not so easy to open for general public

[Clemence]

At the moment I can't think of a better dream solution than using R95 Optisolis to light my rooms. It's your fault, since you made me discover Jetµsolis!

So, you bet I'd be glad to help to find a solution to mod/create our own bulbs!

I know we have Bocian here that is creating some nice custom E27 bulbs, based on Citizen LEDs. He might be of help. Maybe by joining each of our BLF's talent we can build together the ultimate bulb.

I like the sounds: Ultimate bulbs. I’ll try to contact Bocian then. ….or any other light bulb manufacturers

Clemence

Because of the nature of things, safety reasons and the manufacturer’s policy, LED bulbs are not intended to be opened and modified. There will be someone who does not know the basics of electrical rules and we have an electric shock and other problems :frowning: