TROUBLESHOOTING
6. If comparing against a laboratory test, there are several reasons the results may
differ between the LightLab and the laboratory.
a. The sample analyzed by LightLab may not be the same as that run by the
lab. Cannabis is a natural product with variation between different
flowers. We recommend a rigorous sampling method to get the most
accurate view of a crop potency level:
i. Select a “sentinel” plant near the middle of your crop that is a good
representation of your plants
ii. Select at bud from the top, middle and bottom of this plant.
iii. Homogenize the bud with a grinder and analyze each full bud. Bud
weight should be at least 1 gram.
iv. Average the result from the three buds and use the average as your
crop average.
b. If a sample is to be directly compared to a laboratory, we recommend the
following procedure to avoid the variation in sample when comparing
laboratory and LightLab results:
i. Select at least 1-2grams of sample and homogenize using a grinder.
ii. Collect the correct amount of sample for LightLab analysis and
place in a vial.
iii. Collect the required amount of sample for lab analysis and place in
the same type of vial. This should be done at the same time so that
no moisture content changes are likely.
c. The laboratory used may have higher than expected errors. Not all labs
are created the same, and low-cost labs may not have rigorous standards
for sample handling and analysis. We recommend using a reputable lab
that analyzes for potency using HPLC or similar chromatographic
methods.
d. The random error of LightLab and laboratory results may be high enough
to cause significant variation. For example, if both LightLab and a
laboratory have an error of +/- 1%, a 15% sample may be 14% on the
LightLab and 16% from a laboratory. The variation in results will contain
both LightLab and laboratory errors.
e. The sample may have degraded between tests. If the laboratory test was
completed much earlier or later than LightLab analysis, the sample may
have changed. Note acidic forms of cannabinoids (THCA and CBDA) will
degrade into neutral forms (D9THC and CBD). The “Total Potential
D9THC” should remain similar unless significant degradation has
occurred.
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