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It would be good to know how much you can find them for, but you can check in this thread over at the CPF's: link ... Will

You have gotten very good advice so far. Truth is that when you go to LED-based lights for the first time, it feels like trying to drink from a fire hose - too much information. Although not specifically written for diving lights, several months ago I wrote a post in the flashlight forum...

I recently wrote a post in the flashlight forum as an introduction to modifying flashlights and it does have a section on estimating runtimes based on the LED current draw, efficiency of the driver, and of course the capacity of the battery - this might prove useful: Introduction to modifying...

Further down in those threads they do talk about the need for some accurate light source/reference, but I don't know if it was implemented. One of the guys following that thread also created his own IS, but had access to some more fancy equipment, and his measured values were within a small...

Some folks in the flashlight forum have spent considerable effort/time trying to quantify the differences between actual and "claimed" lumens, and even made their own DIY Integrating Sphere to gather some useful comparison data. Here is the post describing the building and usage of the IS...

Keep in mind that for all lights that use a reflector/optic and protecting lens that not all of the output generated by the bulb/filament or LED makes it out of the light - you always have some amount of loss. Not only that, those LED lumens are lumens measured in a special lab fixture, kept at...

Absolutely - well said. Just making potential buyers more knowledgeable means that we can be better prepared to ask more intelligent questions, instead of just taking marketing material at face value. I recently created a thread on how to modify lights, and although it is biased with my...

Great post :) Another member and I were also having a discussion on the subject of testing: http://www.scubaboard.com/forums/lights/321249-lumen-output-diverite-led-lux.html Some sites do independent testing of lights, this one being one of the best (in my opinion) as they use a fairly...

Great start - very cool indeed. I wonder what will happen, or how would this affect the majority of the cheap asian imports - they are perhaps the worst offenders.

I agree with you. What I said is very few companies do it or care. They just want to sell, so they use the largest possible numbers. That is what I was trying to say above. That many vendors throw the LUX measurement as if it were a total output number, which of course is not. I never...

That is the norm. Very few companies actually spend the big bucks necessary to buy/operate their own integrating sphere, or to send equipment to be tested. What I see most of the time: 1) taking the ideal, perfect world lumens from the emiter (which is only true in a laboratory setup with an...

+1 That looks pretty nasty!

On Steve Lindblom's "Divelight Companion", he states that the typical person will need 4 feet of cord, but he also says that a shorter/taller person would need to adjust this length accordingly. When I rebuild a Can light for a diver in Canada, I asked him if the original length was good or...

Yup, great link/video indeed ;)

On the CandlePowerForums we have a very active sub-group that just concentrates on batteries and electronics. If you post your question there, you are likely to get really good advice. Sub-Forums : Flashlight Electronics - Batteries Included ... Note that they will ask you a lot of...

These guys sell the AGRO glands: http://www.oxycheq.com/download/DIY_Parts.pdf Will

You are welcome. I got my SST-50's from AVNET. Even though they say that they are backordered and not available, I got mine after about 2 weeks. No, the dome of the MC-E fits perfectly in those reflectors, but yes, for the P7 you would "have" to enlarge the hole. I can't give you advice...

I am with Packhorse on this one. With proper heatsinking, overdriving is not too bad, and many of us at the flashaholic forums do it routinely, but it all depends on how much overdrive, and the temperatures which the LED will see. If you look at the data sheet for the XP-G you will see that it...

Lucca, I used one of those reflectors from DX (or at least looks like the same one I used) in this 3x MC-E build: Beamshot pictures are on post #2 of that link. Compared to the other lights I used, it is very bright, but it does not have good throw - the beam is more floody, which is to be...

Keep in mind that specs from Asia tend to be on the "exagerated" region :) If you look at the specs and data sheet from Cree here you will see that at max. current of 1000mA, the best bin (R5) will give a theoretical max. of about 312 lumens (139 * 2.25), and that would be at about 3.5 watts...