Hi,
I believe true VHO tubes have a small sleeve that prevents the VHOs from using the cheap Leviton connectors. It is like a small protective plastic around the two pins. The regular NOs don't have it, but the VHOs do have it. I saw this a long time ago, so things may have changed over the years. You might want to check it out before you buy your URI bulbs.
VHO : (from
www.gelighting.com)
NO : (From
www.gelighting.com)
- Victor.