Inaccurate LUX/PPFD readings

[SouthPark]

Originally Posted by guccisimo85

Anyone have an idea what the problem may be?

The issue is a common one in the area of measurements. The associated word is 'uncertainty' or measurement uncertainty.

Even if you were to have an expensive device for measuring ------ that device needs to be properly calibrated. And some details (maybe from specifications) will also tell the user maximum expected error in measurement readings for particular ranges of light level (intensity, or whatever).

Calibration and information about device performance, plus having enough 'good quality' devices all providing similar values ----- helps to reduce the uncertainty in a measurement.

[camille1585]

Originally Posted by SouthPark

The issue is a common one in the area of measurements. The associated word is 'uncertainty' or measurement uncertainty.

Even if you were to have an expensive device for measuring ------ that device needs to be properly calibrated. And some details (maybe from specifications) will also tell the user maximum expected error in measurement readings for particular ranges of light level (intensity, or whatever).

Calibration and information about device performance, plus having enough 'good quality' devices all providing similar values ----- helps to reduce the uncertainty in a measurement.

At work we use 2 separate and fairly high end quantum light meters (Hortispec and a Licor) and even calibrated we're still getting readings with about 15% difference, and we measure 6 points per m2 to account for differences due to the LED bars... I can't even imagine what happens with lower quality meters.

[hypostatic]

I've tried a couple of the highly rated, accessibly priced, light meters from amazon... One of them gave impossible readings lol