Light is usually because the abs sensor has been disturbed but may be because the fluid is low.
Bleeding. How far did you open the nipple? Sometimes more than 1/2 a turn is needed. I asume you have the clear pipe attached to the nipple going into a milk bottle 1/4 full of fluid and have removed the fluid filler cap? With bleeding you need to apply slight pressure on pedal, open nipple and allow pedal to travel to floor and the fluid will travel down the pipe into the bottle showing air bubbles, with pedal still on floor tighten nipple and raise pedal back to rest position which will suck fluid from the reservoir. repeat until no more air and keep an eye on the level of fluid in the reservoir.
Bleeding. How far did you open the nipple? Sometimes more than 1/2 a turn is needed. I asume you have the clear pipe attached to the nipple going into a milk bottle 1/4 full of fluid and have removed the fluid filler cap? With bleeding you need to apply slight pressure on pedal, open nipple and allow pedal to travel to floor and the fluid will travel down the pipe into the bottle showing air bubbles, with pedal still on floor tighten nipple and raise pedal back to rest position which will suck fluid from the reservoir. repeat until no more air and keep an eye on the level of fluid in the reservoir.