So I have these 'worklights' (http://ecx.images-amazon.com/images/I/51ePubC1XFL._SS500_.jpg). Anyone used something similar? Any tips and/or tricks? Lastly, what light bulbs should I use to come as close as I can to the light that my flash unit puts out. I've been using a flash for awhile now, but since recently getting an umbrella I've wanted to add a fill/2nd light with another source. Thanks for any info!