WTS: Calibration lights for DIY integrating spheres / lumen tubes - 67 € -

maukka · 2020-07-12T08:12:25.000Z

One more set of 2x Convoy S2+, XM-L2 (low CRI, cool white) and SST20 (high CRI, neutral white) available from the latest batch. Price for the kit is still 67 € including international shipping.

TimMc · 2020-08-22T05:28:36.000Z

Interested

pol77 · 2020-10-07T15:24:45.000Z

I need to purchase a calibration kit please, as soon as you can manage. I am located in London.

I am interested in measuring all kind of lights, from 2000K 95+ CRI to 7500K 70 CRI. What calibration kit would you recommend for me? Do you think the CW low CRI + NW high CRI will work well?

maukka · 2020-10-07T15:44:59.000Z

Unfortunately I don’t have any lights in stock right now. There hasn’t been much interest lately and I don’t know when I will order the next batch.

pol77 · 2020-10-07T15:47:38.000Z

I can order what lights you need and have them delivered to your preferred address. Would that work for you?

maukka · 2020-10-07T16:45:25.000Z

That’ll work. I’ll hit you with a PM.

pol77 · 2020-10-07T16:57:04.000Z

Thanks. Let me know the details and I will make arrangements at once

maukka · 2021-01-10T16:59:39.000Z

After rummaging my stock I’ve found one S2+ & BLF348 kit for sale if someone’s interested.

edit: this is now reserved

TimMc · 2021-01-12T09:32:03.000Z

Lights arrived. Thanks!

maukka · 2021-01-12T09:41:13.000Z

Haha, goot to hear! What was that, 3-4 months?

TimMc · 2021-01-16T08:36:06.000Z

maukka:

What was that, 3-4 months?

Yeah, about 4 months. I thought it may have been lost :partying_face:

ArtieT59 · 2021-03-12T15:19:56.000Z

Is it possible to buy calibrated lights anywhere atm? Or does anyone recommend an off the shelf light that can be used? Thank tou!

beam0 · 2021-10-03T14:56:37.000Z

ArtieT59:

Is it possible to buy calibrated lights anywhere atm? Or does anyone recommend an off the shelf light that can be used? Thank tou!

I recently got back into flashlights and set up my tube the other day, it seems quite accurate but I’m thinking a calibration light would be a good idea.

So although it’s been 7 months here with no reply, I’d like to know this too!

Tom_E · 2021-10-03T14:58:46.000Z

You would have to ask maukka - oops, he hasn't been on for 6 months, or find an owner willing to sell. What I and couple others did was mail the lights around so I had one shot at using them.

ArtieT59 · 2021-10-03T15:13:58.000Z

Tom E:

You would have to ask maukka - oops, he hasn't been on for 6 months, or find an owner willing to sell. What I and couple others did was mail the lights around so I had one shot at using them.

I was thinking, if one was able to "borrow" some calibrating lights, and you set up your lumen tube with them. Could you then find 3 lights in your collection that are as stable as possible (one light around 300-500lm, one thrower, and one high power 3000-4000lm) and then take their calibrated measurements. then you would send the calibration lights on their way and know that you have 3 lights that are your "standards" to calibrate the lights off of moving forward. is that a good idea? or not as simple as it sounds?

ToyKeeper · 2021-10-03T15:33:17.000Z

ArtieT59:

if one was able to “borrow” some calibrating lights, and you set up your lumen tube with them. Could you then find 3 lights in your collection that are as stable as possible (one light around 300-500lm, one thrower, and one high power 3000-4000lm) and then take their calibrated measurements. then you would send the calibration lights on their way and know that you have 3 lights that are your “standards” to calibrate the lights off of moving forward. is that a good idea? or not as simple as it sounds?

Yes, it works fairly well, and it’s a good idea. You’ll probably need to calibrate your light box / tube more than once. Like, it’s usually good to check the calibration before each measurement session. Things can change between, like if the sensor moves even a little bit, it can throw off future readings. But verifying calibration frequently can help avoid that.

Just be sure the reference lights you choose are truly stable… because something needs to be stable to make any of this work.

Tom_E · 2021-10-03T16:15:51.000Z

Agree, could work

chops728 · 2021-10-03T17:04:19.000Z

you could reverse this option —mail a regulated light you own to some one with a calibrated Tube — they could give you some real readings on a light you already own — just a thought

Lumencraft-Matt · 2023-08-25T15:20:41.491Z

Maukka have you ever used your integrating sphere to measure UV?

geforce73 · 2023-12-03T13:35:54.689Z

Any chance I can buy a set of calibrated lights?