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This can be due to many reasons. The tree could be too young. It can take as long as 5 or 6 years before you ever see a bloom.

It could ,also, be a watering issue if you suspect the tree is of fruiting age.

Here is an article that will help: https://www.gardeningknowhow.com/edible/fruits/lemons/no-flowers-on-lemon-tree.htm

Fortunately, these trees practically root themselves! My method is as follows:

Take the desired cuttings, and remember that smaller cuttings root faster. Dip them into a mixture of crushed aspirin, honey, and a few drops of hot water to mix them. Dip the cut end into this and plant into slightly moist soil. Put the remaining mixture in some water to water these cuttings with when you need to water them. This will ensure they root faster.

It is normal for most, or all of the leaves to fall off during this time. Give it about a month, because sometimes it can take this long. Check occasionally. The first signs of rooting is a white callous material developing where roots will be.

This is either bacterial or fungal in nature. I have a remedy that will take care of either.

Here is my recipe: First, you will want to prime the soil with dolomitic lime, then spread wettable sulfur to Kill off any infection in the soil. I Also like to spray the plant itself. Mix a few drops of one or more of these ingredients into warm water with a spoonful of coconut oil: Rosemary oil, lavender oil, neem oil, garlic oil, cinnamon extract/oil and for really bad cases, also add clove oil.

Here is an article for more information on lemon tree care: https://www.gardeningknowhow.com/edible/fruits/lemons/how-to-grow-a-lemon-tree.htm

The lemon should have some sort of "dormant" period when it shouldn't have flowers or fruit on them. If this is indoors, and has a constant environment then I understand the constant flowering. If it is outdoors, then there will be time of year that it is not flowering.

If this is an indoor tree then prune when the tree is showing the least amount of activity. You can prune any suckers from the base at any time.

Here is an article for more information: https://www.gardeningknowhow.com/edible/fruits/lemons/lemon-tree-pruning.htm

Full spectrum CFLs are supposed to be more similar to daylight and one labeled as 5000K would have light output that averages 5000K, probably including multiple colors. But the quality of this may vary by manufacturer. If the packaging includes a graph of the spectrum the bulb provides, you will be able to see if it provides sufficient red and blue light.

A more traditional (and perhaps more reliable) method would be to buy one "red" 2700-3000K bulb and one "blue" 5000-6500K bulb.

You can pick them as they ripen. Here is an article for more information:https://www.gardeningknowhow.com/edible/fruits/lemons/harvesting-lemons.htm