Budget 5700k CRI 95 100w COBs [Items in Stock]

rngwn · 2019-06-16T02:47:36.000Z

Joshk:

Thanks for looking. That lens is plastic and says up to 50w. I think it may have issues at 100w. How big is the emitter area on yours? I found some glass ones for 26mm LEDs.

The LES of my COBs is 22*22 mm.

As far as the lens is concerned, if you are worried that you might burn out the lens with 100w cobs (and you are fine with getting 50w of light output instead of 100w), you can underpower these COBs by pairing them with a 50w driver (or drive them with half the current).

rngwn · 2019-07-17T08:17:59.000Z

bump

rngwn · 2019-08-01T11:11:47.000Z

Updated Stock:

5700k: 56/60 pcs

BlueSwordM · 2019-08-05T02:04:02.000Z

2x5700k and 3x3500k have been ordered.

Looking forward to high CRI goodness.

rngwn · 2019-08-05T12:07:10.000Z

Updated Stock:

5700k: 54/60 pcs
3500k: 14/20 pcs

rngwn · 2019-08-16T09:20:16.000Z

Shipping cost adjusted now that Post office charges less money.

For order < 5pcs:

Tracked Air Shipping is now $5.5 ($ 4.5 for SEA countries)
Untracked Shipping is now $2.25

Shipping for Order > 5pcs is free

rngwn · 2019-08-24T02:26:28.000Z

Added Express shipping service by DHL

Cost (for any amount of purchases): $25 to $45 depending on destination.

strango · 2019-10-21T11:26:02.000Z

Hi, rngwn.

Do you plan on selling less powerful high cri COBs ?

rngwn · 2019-10-21T11:40:29.000Z

Not yet, at least not in the same form factor. The major reason is that by simply sourcing 100w (the most powerful) variant, it gives buyer choices to run it at lower power settings without having to deal with too many product lineups (which I cannot financially deal with as of now). Also, once overheads (such as shipping costs) are taken into the equation, the lesser variants don’t get that much cheaper.

Aside from some tint shifts (that is can potentially be a negative thing), underdriving a more powerful LEDs will result in better efficiency and longer lifespan. As far as voltages are concerned, all variants in this form factor (except the AC ones) are to be run at the same voltage. All you need to do is to pair it with a less powerful drivers or just feed it with less current.

Joshk · 2019-10-21T11:48:27.000Z

strango:

Hi, rngwn.

Do you plan on selling less powerful high cri COBs ?

I assume you mean lower voltage? How much voltage do you have to work with? Is it batteries or wall power?

strango · 2019-10-21T12:54:28.000Z

The idea is to improve the lightening in my flat (currently ~300 LED Watt, mainly ceiling chandeliers)

I’d better opt for 5-20w COBs and maybe some led chips in 5050/5630/5730/etc size with 0.5w-3w.

100W cob is just over the top for this task imo.
“5mm LED 95+ CRI” from other rngwn’s topic does not suit as well :).

I was looking through alibaba website but finding a reliable supplier with fair HI-CRI LEDs might be a bit tricky…

I have also ordered a pack of 90+cri Samsung LH351D some time ago (thx BLF for Samsung LH351D 5000k 90CRI LED $0.74 with Free Overnight Shipping) but use it for “lazy” flashlight mods only.

Joshk · 2019-10-21T13:04:40.000Z

For lighting my house I use these LED bulbs
I measured the CRI at 93. But be careful, they are USA voltage.

strango · 2019-10-21T13:13:48.000Z

Yes, I saw your feedback here - [Review] 5700K CRI95+ COBs from user rngwn - #9 by Joshk.
But as you’ve already said they are in the USA and apply for USA voltage.

I need to find either led bulbs for 220V or suitable LED chips, preferably directly from China ( e.g. aliexpress/alibaba/taobao )

rngwn · 2019-10-21T13:17:10.000Z

IIRC, there is an Aliexpress store named MARSWALLED who sells High CRI strips.

All you need is 220v to 12v driver and a proper tubing.

Joshk · 2019-10-21T14:41:27.000Z

If you want to use these COBs as 9w lighting, you sure can.
From my review you linked, I have tested/operated them like that.

—0.25A 26.5v—
CCT: 6191
Duv: 0.0008
CRI: 97.3
TLCI: 99

—0.50A 27.02v—
CCT: 6156
Duv: 0.0006
CRI: 97.7
TLCI: 99

id30209 · 2020-09-03T14:41:50.000Z

Need:

2x3500

2x5700

Europe tracked shipping

PM coming

electromage · 2020-11-20T21:37:17.000Z

Do you still have these? I’d like two 5700k.

rngwn · 2020-11-20T22:52:54.000Z

electromage:

Do you still have these? I’d like two 5700k.

Yes.

BlueSwordM · 2022-03-23T00:20:16.000Z

So question: what optics/diffusers would you recommend for such a light?

I still haven’t found any real uses for them, so I want to make some room lighting with it, some particularly bright portable room lighting

rngwn · 2022-03-23T03:42:21.000Z

BlueSwordM:

So question: what optics/diffusers would you recommend for such a light? I still haven’t found any real uses for them, so I want to make some room lighting with it, some particularly bright portable room lighting

For me, I put it in a floodlight and then put a frosting sticker on the glass panel to diffuse the light. Not the perfect solution, but it's good and practical enough for me.