I started with 4 of the old silver aluminum ones. 2 failed, and a third was noisy. Being honest, these were purchased used, and were kept in the same enclosure as the tank. When I bought them, I put them outside under the eaves, so that they had plenty of air, no salt and no water.

Coralvue replaced 3 of them for me, at cost, with the new red/purple ones. They had some saltcreep on them, so I can't really complain. I've since replaced 2 of the 3, and one of them twice. It's cost me shipping one way. Some of the early red/purple ones appeard to have a wiring short - nothing dangerous, they just wouldn't fire. The newer ones - with fans - seem to be better. But, the most recent one to fail was one with fans - and the fans had quit.

Like I said, the customer service has been just plain outstanding. In this hobby, that's hard to find. I'll take an imperfect product with perfect support, anyday.