Judging by the descriptions I found on Google e.g. from Benel

The Falcon Eyes LH-ESB6060K Continuous Daylight Set contains two standard lamp holders each with a foldable 50x50cm softbox, two diffuse cloths (50x50cm), eight 40W energy saving spiral lamps with a power comparability of 200W each and two i-2501/B light stands (2.5m).

This set is ideal for product photography, portrait photography and videography and is suitable for both, beginner and experienced photographers and videographers. This set is easy to mount and allows you to create a soft and even light around a person or object. The softboxes are pre mounted, making the set easy to assemble.

Additional Information about the Falcon Eyes LH-ESB6060K Continuous Daylight Set

If you wish to lower your light output, it is possible to purchase and replace your 40W spiral lamps with 28W spiral lamps. These can be found in the optional accessories tab below. Alternatively, up to seven of the 40W lamps can be screwed loose in order to minimize your light output.

that would be 'No', they are not dimmable - instead you swap to lower-wattage bulbs, or remove some. If they were dimmable, no doubt they would be keen to sell that option to you.

Most energy-saving fluorescents are not dimmable.
You can get them, but they would not have an accurate colour-temperature - see this eBay search for examples.