Hello,
Does anyone know the name of small orange light bulb or the size? and if I can make it white/blue by changing the bulb? It lights up when car unclocks at night and i think it stays on with lowbeam.

 

This is called the Parking Light. It is a W5W style bulb. I just changed mine today along with the low beams.

The parking light bulb I bought was from Azn Optics. It matches my DRL LEDs perfectly (2014 C300 Sport). Works perfect, no errors. Quick delivery. Here's the link:
http://www.aznoptics.com/index.php?m...roducts_id=114

I also swapped my H7 style low beams for the Phillips Diamond Vision bulbs. I bought these on amazon and the link is here:

Even though the description says these are "HID" bulbs, they are NOT HID and are actually halogen bulbs that are a direct replacement with our hideous halogen headlights (a little alliteration). Plug and play for these as well, no errors, no issues so far. I'll be buying another pair of these for my high beams as they are H7 bulbs as well.

Picture taken a couple hours ago. It looks a little more blue in real life. If your current DRL LEDs have a slight blue tint, that's exactly what these replacement bulbs will look like. I'm finally happy with how the front of my car looks lol... I also just ordered these side marker lights to replace the amber ones: http://www.ebay.com/itm/122119480811...%3AMEBIDX%3AIT

Hope this helps!