An example electronic device may include a processor resource and aa memory resource with a set of instructions stored thereon that, when executed, cause the processor resource to retrieve a first brightness characteristic and a second brightness characteristic associated with the light source, associate the first brightness characteristic with a first nits level and the second brightness characteristic with a second nits level using a brightness conversion data block, determine a brightness control signal directly compatible with the light source, and cause the light source to operate via the brightness control signal.