How about your bulb cover ?It will make light spot ?

How about your bulb cover ?It will make light spot ?
You are professional at led bulb.Yes,bulb cover have close relation with light spot
In common,you can see PC cover for led bulb on market,it only have 80% light transmittance,
it will make bad light spot.But we use optical bulb cover,the light transmittance reach 95%,
so it will not make light spot