How many lights is to many?

[swee'pea99]

Three.
You need a front & a back.

 

[totallyfixed]

Yes, 3.

 

[Tin Pot]

When daffodils start blooming and birds start nesting as you go by, it's time to reassess your contribution to light pollution.

It's high time all road users lights were reduced.

 

[potsy]

Once there is no more room on the bars, and only then

 

[martint235]

Any light on a helmet is one too many.

I run two Hopes at the front and two rear: one flashing, one steady (can't remember the make but they are cheap from Planet X)

 

[cosmicbike]

I use a pair of Smart Lunar on the front, 1 fixed, 1, flashing, and a pair of Cateye LD somethings on the back, both flashing. I also have spokelights.