Ƙarfin wutar lantarki na hasken rana yawanci ana kwatanta shi a cikin watts (W), alal misali, 100-watt photovoltaic panel zai iya samar da wutar lantarki 100 watts.Za'a iya zaɓar girman girman da ƙarfin hotunan hoto bisa ga buƙatu, kuma yana iya zama ƙanana, don aikace-aikacen zama da kasuwanci, ko babba, don manyan tsire-tsire na hasken rana.