[Reddart]

In my experience, most cationic epoxy UV initiators require strong low wavelength UV, beyond the currently available UV LED lamps. We needed to use mercury vapor lamps to get efficient curing of cationic systems.

[Enthalpy]

UV Leds presently exist on the market at the wavelengths of medium-pressure mercury lamps
http://www.ushio.co.jp/en/products/light_source/led/index.html
producing as much light as a 800W lamp. The website doesn't tell the price.

UV leds progress very quickly (as semiconductors use to do) and it would be a good idea to keep them in mind, or even to experiment with them, as they may replace many lamps soon.

[Markitron]

Hi Guys,

Thanks again for all the responses. I ended up using what I believe is a standard mercury bulb (I found it lying around) and it cured almost all of the resins easily enough. It does seem time dependent so I assume the ones I tried so far a polymerised via free Radicals. I think a 'dark cure' would be more beneficial to me so I'll try and track down some cationic curing resins.