Is CO2 beneficial for low light planted tanks?

There is widespread belief that only high-light tanks require injected CO2, or conversely that injected CO2 requires a pairing with high light. But, what about CO2 for low light planted tank?
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​​Plants benefit tremendously from CO2 in both strong & low aquarium lighting. This was proved conclusively in controlled experiments that plotted plant growth with varying CO2/light combinations. Read more here. The chart below shows that there is increase in plant mass when CO2 levels is increased, even when light levels are kept the same. Even for low light aquariums, CO2 has a significant impact on improving growth speed and plant health.

​In fact, low lighting + CO2 is one of the most stable combinations available to aquarists. For aquarists looking for slower but healthy growth, using slightly lower light & CO2 levels is a perfect combination. It is also far easier to control algae issues in a tank with lower lighting.

Hardscape heavy setups such as Iwagumis are best run with the combination of CO2 injection paired with low light levels. This combination allows the plants to grow in smoothly but not triggering algae to spawn on the rocks and other hardscape. 

The tank above is grown in with just 50 umols of PAR on the carpet area. All aquarium carpeting plants can spread with this low light level as long as it is paired with CO2 injection.