optics - Fairly Broad Spectrum Light Source Options

I tried this sight before to find filtering options and got fantastic results, so let's try again!

I am setting up an experiment that requires light of two different frequencies (445nm and 350nm). The light ultimately needs to be focused on a small area. I can think of two good ways to make this happen:

1. 
   

   Get a broad spectrum light source that emits over this range - maybe a halogen lamp? - and buy two filters: A high pass that cuts off at ~420nm and a low pass that cuts off at ~380nm. For the low pass, I may also include a high pass in order to make a band pass (or just flat out buy a band pass filter).

   
   

   I will then simply wrap the filters in a black paper cone to "focus" the light (for this experiment, light spread after hitting my target doesn't seem to important). We would use a power meter to tell us what flux is actually hitting our experiment.

   
   

My questions for this approach: What kind of broad spectrum source would you recommend? Can you recommend a retail outlet for this source? Our grant ain't so grand, so afford ability is important. Can you think of a better way to focus the light after it passes through the filters? Again, any retail sources would be appreciated.

1. Get two more highly focused sources. Given our small area focusing requirements, we are looking at lasers (Again, 340nm and 445nm). I have found a couple of retail sources that have such lasers, but they are fairly cost prohibitive. Do you know of any sources that sell such lasers - power sources and all - for <500?

Thank you in advance for any help and recommendations. If a paper is produced from this - which I very much am counting on - I will thank the guy who provides the best answer in it (if that is an incentive).