My house have the small problem too. My sifu say this is a very small peanut problem. Sometime they do look like facing your main door but their actual position is facing your side wall thats becos your parking area is a wide area n nothing block the view of the street light. Generally.just hang a special mirror call "San(mountain) Hai (sea)  Zhen" outside your house will do. 

Alternatively, just shift your thinking a bit,treat it as a free light for your house carpark during night time, u will feel better,after all fengshui is more to common sense and science,if u are comfortable then everything will be all right.

Thanks ! all advice, by the way is it possible i put one big mirror inside the house mean each time i open to door it automatic reflect the poison arrow. Because when i enter my house is block by one wall, then i put that mirror on that wall as reflection of the poison arrow ( street lighting).

bro, if u are doing reno, just change the door location.
i change mine, opposite got triangle facing my main door. i moved it place a bit, change to sliding door and open from the other side.
but of course, ask someone first before you do so.

It cost me a lot. After i do the research, is it posisble put the "PAK KUA" on top of main entrance door? But very funny for others see one 'Pak Kua" on top door, they will suspect this house got any 'spirit' or ghost. It look very weird for others la....

I'm now very confuse. If i do nothing, i worry can affect anything to family...please help!

My new house ( double storey ) also face a feng shui problem. The street lighting ( poison arrow ) facing direct to our main door ( main entrance) . Now i also need to figure out how to antidote this problem.. Any sifu can give advise?? Thanks

Another thing you can do is write some nice words on the "tiang" like "对我发财“ or "对我万事如意“. Some of my relatives did this. 

After the all advice, i decide build one wall up to roof just a size as door main entrance. The wall just 4 ft from the outside main entrance. It can block the view and also save my cost to relocate the main door. Now i searching the decorative of the wall to make my house look more modern look.