Is it okay to use geometric shaped lights?

[Cecil Lee]

Angular shapes often may look sharp or pointed.
And may cause or create a Sha Qi or Poison arrow(s)

For example, one look and one can visualise the sharp point at the bottom of this classic light:-

The light looks like if it is hung in the middle of a balcony.. seems like a poison arrow or Sha Qi.

However, although these lights are not rounded and may have sharp curves; it does not look anything like the above sharp point:

Thus may seem pointy.. but looks more like a pussy cat when compared to the first illustration.

Of course these rounded "bird cage" style lights are the safest .. to please the ultra-conservatives.

[Cecil Lee]

So Long as the lights don't seem to look threatening or makes one feel uneasy...

Your taste is as much your preference as anyone's else.

[Cecil Lee]

These lights are at the borderline and can be subjective...

At the end of the day, it is how the owner feels is most important. 

Do remember that Human/Man luck is as equally important as Feng Shui or if not more so. 

Thus if one feels happy with it and confident.. then this is a great boost to one's Human or man luck.

This is relevant: 

"Follow your heart regardless of what others tell you to do.

At the end of the day, it is you who have to live with your decision not them."

[Cecil Lee]

A geometric ceiling light..

[Cecil Lee]

Client: Hi Master.  Can i use one of these lightings for my balcony?  Thx

Reply: It is also about common sense
Reply: You forgot of windy conditions??

Client: Ya.. My balcony quite windy

Reply: Common sense.

Client: I asked my wife to consider again... Thx

Reply: Go look at how many others place such hanging lights? Nowadays these lights are light....

Client: Thx for the advice,  Master.  I let my wife know and choose again... Thx

Reply: Stylish does not mean safety first

Client: Thx