Bruce -

Linas Kudzma reported that he uses spiral bulbs in his UV printer. I've seen his work - it's gorgeous - although I suspect that we should assign more credit to his vision and talent than to the effectiveness of the UV source.

I just completed my UV source this week based on spiral bulbs. I have not tested it yet - the chemicals were shipped from Bostick & Sullivan on Tuesday. I used six bulbs on 6" centers in a box with interior dimensions of 12" x 18".

These bulbs are rated 120v. Therefore, they must be wired in parallel - not in series!

I bought my bulbs from Ray Lighting. They have a web site at