... 2 years 1).If driver failed, we'll send you a new driver; 2).If LED failed, we'll send ... LED; 3).Unclear reason, we will send you a new full set. All freight at our side;Professional ... Control1).Light efficiency:110lm LED chip,in housing about 80lm/w2).Driver Efficiency >90% in reality3).CRI>82Ra,subject color ... month7).All managed by software2.Payment Term O/A,L/C,D/A,D/P,T/T,Western Union,Paypal etc ...