I have to say I wouldn't recommend UV LEDs, they tend to give a "spotty" 
pattern rather than good even exposure unless you use several layers of 
tissue paper to spread the light out a bit.  They are also a bugger to 
drive when you have 300 of them.  Doable in a pinch but I would 
recommend some kind of tube in preference.

Alan B. Pearce wrote:
>> Has anyone used a Hagen Aqua Glo bulb to expose pcb's?
>> It is an aquarium uv lamp. 
>>
>> Or if you haven't used that bulb can you confirm that
>> a 450nm peak is what is needed for doing this.
>>     
>
> Elektor recently ran a project using UV LEDs for this.
>   

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