lighting largely depends on the placement of your bowl and the plants selected. if you are near a window, then the window could be a source of light to sustain your plants. If the bowl is placed away from a window and your plants are more demanding than say moss, then a dedicated lamp would be necessary.
My bowl uses a full spectrum lamp but the photo period has been dramatically decreased in the summer months due to rising temperatures. Its all trial and error until you find out what works for you. Having too muich light will also have you duking it out with algae so make small changes and see how things go. Shrimp are perfect for this type of setup, though my CBS did not survive my recent two week trip abroad. i recommend neocaridinas which are more heat tolerant.
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"I am Groot", the faithful protector