Microfading Tester International Discussion Group

Hello MFT community,

I am wanting to shorten the test duration for a sample by increasing the current. Following the Getty protocol for plotting the calibration data in excel, the maximum current within the linear range is 800mA. Is there any danger or risks that I need to consider if I decide to set the current to a higher level than the linear range - say 900 or 950mA. Would this affect the reliability of the ageing data?

For context, we are trying to see how long it will take for a sample to reach a certain DE in the test, but also don't want each test run to be 1.5 hours long.

Any advice that you can provide would be appreciated.

Thanks,

Noni

Dear Noni,

I think it's OK to use a higher current of 900 or 950 mA to elevate the power of your light source. The obvious consequence is that it will fade faster, which is what you want!

In terms of using a current value that is less linear than the range of values from ~400-800 mA, this might impact potential modeling of the results. If we stay within the more linear range, one might assume that an increase in current will produce a predictable increase in power and, presumably, a predictable change in color.

Have any other Fotonowy users employed currents of 900 mA in testing?

Hello MFT community,

I am wanting to shorten the test duration for a sample by increasing the current. Following the Getty protocol for plotting the calibration data in excel, the maximum current within the linear range is 800mA. Is there any danger or risks that I need to consider if I decide to set the current to a higher level than the linear range - say 900 or 950mA. Would this affect the reliability of the ageing data?

For context, we are trying to see how long it will take for a sample to reach a certain DE in the test, but also don't want each test run to be 1.5 hours long.

Any advice that you can provide would be appreciated.

Thanks,

Noni

Dear Noni,

I think it's OK to use a higher current of 900 or 950 mA to elevate the power of your light source. The obvious consequence is that it will fade faster, which is what you want!

In terms of using a current value that is less linear than the range of values from ~400-800 mA, this might impact potential modeling of the results. If we stay within the more linear range, one might assume that an increase in current will produce a predictable increase in power and, presumably, a predictable change in color.

Have any other Fotonowy users employed currents of 900 mA in testing?

Hello MFT community,

I am wanting to shorten the test duration for a sample by increasing the current. Following the Getty protocol for plotting the calibration data in excel, the maximum current within the linear range is 800mA. Is there any danger or risks that I need to consider if I decide to set the current to a higher level than the linear range - say 900 or 950mA. Would this affect the reliability of the ageing data?

For context, we are trying to see how long it will take for a sample to reach a certain DE in the test, but also don't want each test run to be 1.5 hours long.

Any advice that you can provide would be appreciated.

Thanks,

Noni