check it at night. I can see my bulb on during the day if I look down directly at it.
By Edwiin Wyld(e)
There is a small blue light on top that shows if UV light is on.It is hard to see in direct light
By Pete MacMillan
There is a blue glow that you can see thru the clear Lense on top...easier at night! The OEM bulbs are not the greatest. See my review for the one's I used. It is still working good.
By Kitty Wesley