I have an underwater light that uses a PAR 36 size bulb (GE 4515, I think) that I would like to upgrade to LED. There are a few aftermarket bulbs available (Trilliant 36 is one: http://www.grote.com/product.php?product_number=63861-5 ) but they don't appear to be much brighter than what I already have and don't produce the kind of spot beam that I need for scuba diving. It was suggested to me that many people make their own LED bulbs these days, and I could probably do much better going that route. Does anyone know of someone who is very good at doing this, and point me in their general direction?? Thanks.