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:


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*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.


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*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).
 A: I haven't checked exhaustively, but I don't think you'll get a laser for under 500 (dollars?). I would recommend a LED light source. Here is a page with an example; they're more than $500 but less than $1000.
I seem to remember that our lab got a cheap fiber-coupled white light LED source for 300 euros, but I can't remember the brand right now and I can't find it online.
Perhaps "black light" fluorescent tubes would meet your needs - the article on Wikipedia has a table listing typical emission peaks depending on what kind of phosphor is used in the tube. I have no idea where the best place to buy those is, but a Google search seems to show that they're available everywhere, perhaps with varying quality.
As for a better way of focusing, it's hard to say without knowing more about your requirements - apparently you don't need temporally coherent light, since you're considering not using a laser, but do you need spatially coherent light? You say light spread doesn't matter, so I assume not. Do note that by "focusing" with a black paper cone, you'll be throwing a lot of light away; perhaps you might use lenses. Microscope objectives are expensive, but perhaps if you can "borrow" one from a microscope in the area, you could use one to focus.
A: Can you be more specific about what you are trying to do, especially your power/focusing requirements, and the wavelength sensitivity of your experiment?
350nm LEDs are available from this company: https://dcomponents.com/?keyword=350nm&content=results
445nm LEDs are also widely available, and at this wavelength high powered laser diodes which can be focused tightly can also be obtained: http://www.lasersurplusparts.com/shop/80-1w-445nm-laser-diodes.html
For 350nm laser light, your options are much more limited. HeCd has a line at 325, and N2 lasers emit around 337. Pulsed N2 lasers can be built fairly cheaply and easily but are not very coherent.
