10W Class High Density COB. The Delux® HRA0404 High-Density (HD) LED Array redefines what is possible for LED lighting in high-intensity applications. The HRA0404 LED Array delivers more than 1,000 lumens in a 4-mm light source that allows lighting manufactures to design smaller, more-efficient spot lights, reduce the size of halogen replacements by half and deliver twice the CBCP of ceramic metal halide at 30 percent less power.