To some customers, I think they don’t know clearly how to choose PY21W LED.

PY21W LED is different from PY21W halogen bulb.

PY21W shall be amber or yellow color. If you choose amber color for PY21W LED, the lumens will be cut down so much.

So we suggest you can use white PY21W instead of amber PY21W if lamps’ covers are red or yellow because lumens of white PY21W is double as much as amber color.