BW-20 is equipped with selectable blue and white LED light provides most uniform trans light emission. It’s applicable for Bio-Safe applications in whole series imaging systems through built-in power source or external power adaptor. BW-20 gets rid of the way of traditional Epi light excitation but using the unique transparent Multi-Inner-Reflection to get most uniform light intensity in the market. It remains the best excitation efficiency for agarose and protein Gel. BW-20 can't only be directly adapted to all Wealtec Gel Imagers but also any brand Gel Imager.