 
 <prompt> How light orbs dey resemble fixtures? Given di last question, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: One important property of light fixtures na di luminous efficacy or wall-plug efficiency, wey mean di amount of usable light wey dey come out from di fixture per energy wey dem use, wey dem dey measure usually for lumen per watt. A fixture wey dey use light sources wey fit be replaced 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 go dey. If dem shade di light, e go normally reduce di efficacy but e go increase di directionality and di visual comfort probability. 