What’s difference between p21w and py21w?

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Although P21W and PY21W are all the same power, but they are different color.

Most of P21W are all clear color, which is 12v 21w.

But PY21W are always amber color.

Meanwhile, P21W is BA15S, but PY21W is BAU15S, so their base types are different.

In order to make you clearly P21W and PY21W, I will show you picture as below.

If you want to get more details about P21W vs PY21W, please contact me without any delay.