The only higher-power waterproof hosts I was aware of are from Lazerer. I purchased this one. My research indicated the Eagle Pair were the best available and appeared to be used by most serious lasers hobbyists. I purchased 2 pairs through Survival laser which is where I purchased the 1.8W 445nm. I haven't been able to locate a high power 405nm yet. I'm waiting for someone to produce one in a waterproof host. Nothing new yet - Current efforts detailed earlier in the thread. Both methods are viable. Lasing through the glass is the simplest, but operating submerged allows you to get closer, reduce potential reflections and use your hand to sheild the beam endpoint from the livestock. It also dramatically increases the thermal duty cycle. That said, both methods work well.