Using Merriam-Webster as a baseline, the word 'togglable' doesn't exist yet. It has made it into Wiktionary. It also makes enough intuitive sense that I don't have a problem using it. But, I'm wondering if a synonym exists. Is there another word that means "Able to be turned on and off"?
Will switchable do?
The three separately switchable, compact fluorescent lamps in red, green and blue, not only produce these primary colours, but also three secondary-colour pastel shades and one shade of white.