Some lemon oils are nearly twice as thick as others and others are runnier. I can always tell when some oils have added filler oils to make them thicker so they don't appear so watery than a thick lemon oil with high constituents grown in mineral rich soil and lots of sun. Note that some lemon distilleries are distilling their lemon oils much more to thicken them and give a more concentrated smell. As a raw foodist, I know what heating things up too much can do. I know when an oil has been cut even by 5 to 10%. The oil always has a signature smell when its cut with another oil. Many people complain when the oils are too watery. A good lemon oil should be naturally thicker without having to add a thickener oil.
When you use a green laser pen and shine through the oils, even if there is 5% filler oil the laser is refracted differently. Stop trying to cut corners. These companies might try this and get away with it with some people but not me. I know which companies redistill their oil too long to patch up their screw ups and which get it right. It is not hard to tell when you do several testes on the oils and compare them yourself.
If you want to compare different oils like I did and find the oil you like best for yourself, make contact.