Light source analisys with a new toy . . .

[blue moon]

Partnered with Richard Greaves on getting a Radiometer. These are some findings shortly after setting it up without loading the calibration curves. They are also taken from various distances and angles so the intensity is not consistent, but it gives a great idea of what's going on.

LED Shop lighting is the overhead lights (we converted our fluorescents to LED in December). 5000K. Interestingly, the light does not start until 425-430nm so I am curious if that can expose the screens. My understanding is that 420 is about the max that could. 'will have to ask some questions.

fluo6k is the 8' long fluorescent tube at 6000K. Output from lower temperature bulbs was almost identical on the lower end. It is interesting to see that there is a small spike at 370 and than a bigger one a 405. This confirms what we found before that caused us to cover the CTS so the screens are not exposed to the bulbs.

halogen is a 500W work light that many startup shops use to expose the screens. It is clear from the graph that there is very little UV compared to the visible light.

I did not ask for permission to post the results from the LED units we have here, but needles to say, they are as described. Single tall peak of one wavelength.

Richard will take some measurements next week on the MH, but we have all seen those graphs before. . .

pierre

[blue moon]

quick update, we left a screen under one of the shop LED lights that starts at 425nm for few hours and tested. It clearly exposed and crosslinked the emulsion to some degree. We could still blow it out, but it was very different from the blocked area. This means our PHU2 is sensitive in the 425nm area!


pierre

[inkman996]

This is pretty interesting last month we converted completely to LED as you did. BTW it cost us a little more than what you paid with the %40 incentive.

Well the lighting expert was here and I grilled him on the specs of the bulbs since nothing was listed. He made some calls and was told they output starting around 500nm so he assured me our screens should be safe. Regardless i still did the quarter test and have been using the light room with straight LED bulbs and as of yet no noticeable cross linking. We could be using different bulbs from a different company, hard to tell since the new bulbs had nothing but generic info on them.

[cbjamel]

The difference might be in the cool white vs soft white etc. or if they 6000k or 5000k outputs etc..
Shane

[blue moon]

This is pretty interesting last month we converted completely to LED as you did. BTW it cost us a little more than what you paid with the %40 incentive.

Well the lighting expert was here and I grilled him on the specs of the bulbs since nothing was listed. He made some calls and was told they output starting around 500nm so he assured me our screens should be safe. Regardless i still did the quarter test and have been using the light room with straight LED bulbs and as of yet no noticeable cross linking. We could be using different bulbs from a different company, hard to tell since the new bulbs had nothing but generic info on them.

If you send me a bulb, I'll test it for you and you'll know for a fact what is going on!

Ours are 5000k as that is what the Pantone book calls for. The lights in the dark room were bought at BJ's with bulls in them and they just happen to be 5K also. We do have some 6500k LED lights up front and they read more or less the same as the 5K. As Shane mentioned, it will be different from one brand to another though.

Pierre

[Prōdigium]

I did not ask for permission to post the results from the LED units we have here, but needles to say, they are as described. Single tall peak of one wavelength.

Not sure why you would require any permission. If your performing tests on ANY product you are not bound by any laws to keep your results private. The NM wavelegths of exposure units are not trade secrets by any stretch of the imagination and the only company that has a patent actually states them on the patent for all to see.

I would be curious as to how long it took to expose the screen and at roughly the distance. LED shop lights are typically not that powerful in wattage's so to expose a screen is interesting

[blue moon]

I did not ask for permission to post the results from the LED units we have here, but needles to say, they are as described. Single tall peak of one wavelength.

Not sure why you would require any permission. If your performing tests on ANY product you are not bound by any laws to keep your results private. The NM wavelegths of exposure units are not trade secrets by any stretch of the imagination and the only company that has a patent actually states them on the patent for all to see.

I would be curious as to how long it took to expose the screen and at roughly the distance. LED shop lights are typically not that powerful in wattage's so to expose a screen is interesting

the reason we would need permission is because we were helping test the equipment for the manufacturer.

pierre