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[hank pronk via Personal_Submersibles]

Sean. The bellows have sufficient compression to allow for a small air bubble. I chose canola for environmental reasons.  If you notice in videos from dives in Gamma the colour from the light is perfect. By fluke admittedly. The reflectors don’t help after comparing with or without.   On Gamma I had a box style deflector that helped improve the lighting by narrowing the beam. I think that will depend on the specific sub. For instance this light is going on a K250 under the MBT so may or may not need a shroud.  
Hank

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> On Mar 7, 2020, at 1:00 PM, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Good video.
> 
> A couple of comments:
> 
> How much deflection do the flexible pipe couplers exhibit when you compress them by hand? Assuming you get all of the air out of the oil (which incidentally, you can improve with vacuum degassing prior to sealing the tube), the compensation needs sufficient deflection to accommodate the volume change due to compression at depth, but also possibly some thermal expansion from the LED drivers heating the oil. I can't imagine that it needs much, but I'm not familiar with the couplers.
> 
> Canola seems an odd choice, given that it probably isn't tested for dielectric strength, and has a yellow hue. Certainly more environmental friendly in the event of a leak than a mineral oil with greater optical clarity though. Was that your thinking?
> 
> Given that the LED array was from a truck light bar, I presume that it is a 12 VDC unit? Are you running a 12V bus, or using a DC/DC converter?
> 
> You mentioned that you discard the reflectors, which probably makes sense given the lensing effect of the acrylic tube, but then I wonder if you are doing anything for beam control in their place? What is the beam angle of the bare emitter, and do you do any blacking out of some sector of the tube to control projection? Do you use this centered on your viewing angle, or displaced to the side(s) to manage backscatter?
> 
> Sean
> 
> 
> 
> -------- Original Message --------
> On Mar. 7, 2020, 09:30, hank pronk via Personal_Submersibles < personal_submersibles at psubs.org> wrote:
> 
>                             15:13 Now playing Watch later Watch later Add to queue Add to queue                
> 
> 	
> How To Make An Underwater Submarine LED Light Bar
> In this video I am converting an everyday LED light bar into the deep diving, oil filled, underwater light bar t...
> 
> 
> 
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