Has anybody here used these 8 degree optics with seoul?

[cage]

Are they any good?
http://cgi.ebay.com/Brand-NEW-8-degree-lens-for-Lux-LEDs-White-5pcs_W0QQitemZ230113201587QQihZ013QQcategoryZ66954QQcmdZViewItem

 

[nanotech17]

Re: Has anybody used these 8 degree optics with seoul?

something similiar
http://www.candlepowerforums.com/vb/showthread.php?t=158520&highlight=aepoc

 

[cage]

Re: Has anybody used these 8 degree optics with seoul?

Thanks, but I was interested in these particularly because they are so cheap.