Conventional Fixtures - Help with ETC Source 4 19 Degree Star burst

[eventman]

I am getting a star burst type effect from most of my source 4 19 degree lights and i am not sure what the cause of it is. It is not terribly noticeable when the light is focused sharp but when i soften it it becomes rather noticeable. These are all the newer models of the lights. I was wondering if anyone has had this issue before and how you solved it?

[hobbsies]

I am getting a star burst type effect from most of my source 4 19 degree lights and i am not sure what the cause of it is. It is not terribly noticeable when the light is focused sharp but when i soften it it becomes rather noticeable. These are all the newer models of the lights. I was wondering if anyone has had this issue before and how you solved it?

Is it a bench issue?

[eventman]

When I bench focus the light it does not change the look of the star burst.

[derekleffew]

... from most of my source 4 19 degree lights ...

Try swapping the lamp cap of a fixture that's not doing it with one that is. Does the problem follow the fixture or the lamp burner?

If it follows the fixture, try swapping lens tubes.

Lamp/reflector/lens--the problem has to be one of the three (or a combination).

[hobbsies]

I've seen the starburst effects with old 360qs with the wrong lamp in them (one that's too long), but rarely, if ever source fours. That's why I thought it could be a bench issue, because the lamp is too far forward or something. How new are these fixtures?

[gafftapegreenia]

Is the lens in the right slot in the tube?