Hi guyz, its me again...
Here another project I completed a short while ago:
Its a very powerfull 10watt mini HID torch: 250,000 peak beam CP. Its waterresistand up to depths of 200 ft. Has +2 hours of burntime on one charge.
The reflector is made from an used projector-bulb: This perfect parabolic dichoric (cold) reflector is capable of withstanding extreme temperatures and has more than 98% overall reflection.
The green ring has a little magnet embedded, switching a reed-switch inside the torch. This reed triggers two 2amp power relays placed in the reflector-compartment: A highly durable, most waterresistand solution.
I removed the protective bulb from the Solarc 10watt HID lamp to gain a few % of lumens and to prevent "optical arc dissplacement"
The lamp is cemented very exactly in the reflector to obtain a nearly perfect beampattern with a 250,000 Cp hotspot in the middle:
The inside is quite simple: Using three 2.4Ah 18650 Li-Ion cells. Each cell has its own connector at the back of the torch.
The inside temperature is kept well within specs by the large heatsink at the outside of the lamphead: its completely surrounding the ballast. The inside temp. doesn't rise more than 15 deg. centigrade above the environment-temp. during continous operation.
The high-candlepower hotspot in the center of the beam is created by a very small hotspot in the arc near the anode:
The surface brightness of this hotspot is several times higher than the mean surface brightness of the entire arc.
To successfully concentrate the light of this hotspot you need a perfect parabolic reflector. And you need to remove the protective bulb which causes an optical effect that makes parabolic reflectors useless for this purpose!
The front window it a multilayer coated quartz window 4mm thick, hardly visible on the pics due to its high transmission: 99.3%!
All this adds up: 98% reflective reflector, removed protective bulb, overdriven lamp and 99.3% transmitting window: Making most torchlumens out of bulblumens.
Wanna know more, ask me!