For anyone who comes across this thread, assuming you have Tuya Smart Life bulbs you can achieve this using the Smart Device step. Combined with some pauses you could create some pretty complex lighting affects.
To change the colour of your lights, you want to select the color_data or color_data_v2 property. Here are some examples of the values you should pass:
For other colours, play around with the h value which is the hue.
To change the brightness, you want the bright_value property, and then use the slider to select the brightness you're after.
It can be a bit hit and miss depending on the individual device, so if you have any questions post back here and I'll try to help.