Purchased

Carbon Arc and their parts are available on the web, and for sale on eBay! Just Ordered four of these rods. They are 12 inches long, half inch in diameter. I am very curious to see how much continuous arc can be had with these. If one can get 24 hours - that's two hydroponic days. Cost - six dollars a day. The price drops quite a bit if you buy in bulk - just $3.62 apiece if you buy 100 or more. Depending on just how long a pair lasts will determine how wise a bulk investment in these would be. Imagine if you could get a week out of a pair! Then if someone bought a thousand of them, they'd have carbon arc for quite a while!

Offered by Brian.

Carbon arc rods with copper coating around them are also available though local welding supply houses.

Offered by Mike.