Aquabot
Contributor
DIY Diver is speaking here : A 35 Watt HID should be roughly somewhere about 3000 lumens. Check your battery pack and see both what the voltage and capacity is. Measure your light head interior dimensions. Then go peruse dx.com and see if you can find an LED drop in module to fit both your desired light output, battery voltage, and space available. If you find something that fits, then decide if you want to have fun doing a little DIY work. If you don't permanently modify anything on your current light head you can always fall back on having the HID unit fixed.
If you want even more fun check out: http://www.scubaboard.com/forums/ma...pot-diffuse-video-project-detailed-plans.html
A possible drop-in http://www.kaidomain.com/product/details.S021393
"Powered by a 20 Amp Li-Ion Battery providing 330 minutes of burn time3000 Lumen Output @ 6000 Kelvin
12.5”(31.75cm) Length, 3.5”(8.89cm) Diameter
Dry Weight 7lb(3.2kg) 3lbs(1.36) Negative in the water
Recharge Time from complete discharge 12 hours
18.00 ELC – 230wh TSA compliant for air travel"
These are the stats about my light from LM webpage itself. I dont think I would be able to convert this light anyways without any permanent changes just because of the design, which I honestly would want to do after paying what i did for it.