Bear in mind, with the UV you are trying to overcome a reaction barrier (break organic bonds in the creepy-crawlies). If a given photon does not have enough energy (low enough wavelength) to overcome said barrier when it crashes into that bond, adding more photons will not get you anywhere. You will just have a whole lot more photons failing to break the bond. So essentially, with LEDs, it's not so much trying to add so many LEDs that the intensity compensates for the greater wavelength as adding so many LEDs that the miniscule fraction of low wavelength light that the things manage to produce actually becomes significant. Although this solution might have the potential to add a lot of bling to the setup, I don't think it will be that useful in killing microbes.
If you're looking for cheap, look for guides online to building an EPROM eraser. I posted a few links in one of the old UV threads. They usually suggest getting a germicidal fluorescent lamp that screws in to a plain old 4w fluorescent bulb socket, probably for less than $15 total. Biggest problem for a DIY solution is probably mounting the light in such a way that the UV isn't blocked by something we usually think of as "clear" (like a reservoir wall). Oh, and making really sure you can't end up getting an eyefull of the light, of course.
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