▁color , ▁unless ▁a ▁Lan tern ▁is ▁skill ful ▁enough ▁to ▁know ▁how ▁to ▁change ▁the ▁EM ▁spectrum ▁the ▁construct ▁em its . ▁Hal ▁Jordan ▁has ▁shown ▁the ▁ability ▁to ▁have ▁a ▁construct ▁emit ▁k rypt on ite ▁radiation ▁under ▁Bat man ' s ▁guidance . ▁ ▁The ▁rings ▁of ▁the ▁Green ▁Lan tern ▁Corps ▁allow ▁their ▁bear ers ▁to ▁travel ▁very ▁quickly ▁across ▁inter stell ar ▁distances , ▁fast ▁enough ▁that ▁they ▁can ▁efficiently ▁pat rol ▁the ▁universe . ▁They ▁allow ▁the ▁wear er ▁to ▁surv ive ▁in ▁virt ually ▁any ▁environment , ▁and ▁also ▁remove ▁the ▁need ▁to ▁eat , ▁sleep ▁and ▁pass ▁waste . ▁The ▁rings ▁can ▁translate ▁pract ically ▁any ▁language ▁in ▁the ▁universe . ▁ ▁They ▁possess ▁powerful ▁sens ors ▁that ▁can ▁identify ▁and ▁analyze ▁objects . ▁Lan tern s ▁are ▁granted ▁full ▁access ▁to ▁all ▁Guardian ▁knowledge ▁by ▁their ▁rings ▁through ▁the ▁Book ▁of ▁O a . ▁ ▁A ▁not ew orth y ▁power ▁the ▁rings ▁do ▁not ▁have ▁is ▁the ▁ability ▁to ▁automatically ▁he al ▁inj uries , ▁though ▁they ▁can ▁provide ▁shield ing . ▁In ▁Hal ▁Jordan ' s ▁origin ▁story , ▁Ab in ▁Sur ▁passed ▁on ▁his ▁ring ▁to ▁Hal ▁because ▁he ▁was ▁unable ▁to ▁treat ▁his ▁own ▁fatal ▁inj uries . ▁If ▁the ▁Green ▁Lan tern ▁happens ▁to ▁be ▁a ▁sk illed ▁phys ician , ▁then ▁the ▁ring ▁can ▁be ▁in valu able ▁as ▁it ▁can ▁conj ure ▁any ▁conce iv able ▁medical ▁tool , ▁but ▁it ▁cannot ▁do ▁much ▁for ▁a ▁Lan