Blue-Merge Technology (BMT) TurboBMT Turbo is the perfect merging of forensic wavelengths. It is proven that shorter wavelengths such as 450 nm are more useful in body fluids, teeth and bone fragments, bite marks and bruise work, while longer wavelengths such as 480 nm are more useful in finding trace evidence and fingerprint work. BMT mixes a unique profile of forensic wavelengths to produce the perfect blend. With the BMT light you only need to go over the scene or evidence one time with one filter to complete 99.5% of evidence detection, collection, and documentation work.