 
 <prompt> Wetin fit be preference? Based on di last question, write one context wey get di answer. E fit be 1 - 20 sentences. Context: <response>: ```An important property of light fixtures na di luminous efficacy or wall-plug efficiency, meaning di amount of usable light wey dey come out from di fixture per energy wey dem use, usually measured in lumen per watt. A fixture wey dey use replaceable light sources fit get efficiency wey dem go talk say na di percentage of light wey dey pass from di "bulb" go di surroundings. Di more transparent di lighting fixture be, di higher di efficacy. If dem shade di light, e go normally reduce efficacy but increase di directionality and di visual comfort probability.``` 