It all depends on if you want to make the entire die brighter or just a smaller portion in the center?
Focussing an LED on such a small point will be difficult if you want high efficiency. A 450nm laser would be much easier to focus, but itâs more difficult to get a uniform beam (I have tried someting like this here, itâs in German).
If you want to make the whole die much brighter you will need a lot of blue light (similar to the CFT-90 itself). This would require much more power, big batteries, powerful cooling etc.
I donât have a GT, Iâm putting a CFT90 in this flashlight, not a GT
Maybe you posted in the wrong thread?
Mhm, I specifically asked phoenix to make and install the mount for me, they did a great job.
You can double the intensity by adding more light to the core, however you lose a lot of efficiency since you would need something like 3 additional CFT90s in order to get a 2x improvement.
Similar to how a wavien collar collects an additional 75% more light and doubles the intensity.
The best option is to use lasers to excite phosphor, as they can make a very small spot of high intensity blue light.
Ok, so it does have decent potential then. In this case, I wasnât necessarily thinking of doubling the luminance by adding extra CFT-90âs because of both power requirements and cost, but rather giving it a measurable boost by adding a less powerful and cheaper secondary LED. On the other hand, would it be worth the extra complexity? Probably not. Not sure you even have room for a lens stack like that.
âWe generally do not coat with silver. Itâs somewhat problematic to coat and even with an overcoat it isnât very durable. Silver is very active in a normal air environment. The price would be roughly twice that of a single piece with aluminum. â
-Phoenix Electroforms
Iâm not sure if mine is overcoated, it probably is just plain aluminum. I didnât ask for any special additional coatings since aluminum is pretty durable as long as there isnât a ton of UV like from an arc lamp.
No idea, I havenât used Optiforms.
I wasnât going to pay double to get my reflector from them.
This is the info that Phoenix gave me a while ago:
âSilver is more reflective in the visible than rhodium. We have many customers do a google search for the most reflective materials. Silver always rises to the top. We recommend vacuum deposited aluminum. It is far less expensive. It is less reactive in the atmosphere. It has a reflectance in the 92-95% range which is acceptable for just about anything other than sensitive measuring equipment.
We do provide vacuum deposited aluminum with a SiO2 overcoat as well as rhodium.â
Maybe the coating I got is AlSiO2.
EDIT- yeah just checked the specs document, it is SiO2 coated aluminum.
I just found your build threads on your so called âflashlightâ builds Enderman, I must say I greatly admire your engineering skills and workmanship on your projects. Seriously great work.
Here are a few overexposed beamshots which look really cool
And here are some which arenât overexposed. The sky wasnât super dark because itâs summer and it was early morning (like 2am).
Still waiting for my custom CFT90 driver to arrive, canât wait to see what 5x more lumens will do to the beam!
I have to admit, focusing this thing is a pain even with the three-screw system, part of the reason being the small LED and huge angle off-axis (like 85 degrees) that most of the reflector collects light at.
Havenât been able to get more than 7.5mcd yet which is a bit disappointing.
I will be attempting to focus it better and measure again in one or two weeks, Iâll let you guys know if I get an improvement.
This optic system is great for getting extremely high luminous efficiency, collecting close to 90% of all the lumens into the beam and spot (more than any other type of optic!) so the CFT90 or other high output LED (dedomed XHP70.2? ) is probably a better fit for this type of flashlight.
I donât recommend this type of retro-reflector for anyone making a superthrower, unless you use a long focal length mirror similar to a telescope, in which case it will behave more like a lens and lose the high efficiency.
Still glad that this set a new record for LED searchlights/flashlights as far as I know there isnât any other LED light that can throw further, not even LED lighthouses.
Same, I think this upgrade will make the whole project worth it, despite lower than expected candela.
It should also make it easier to focus thanks to the larger die, so who knows, it might get higher than 7.5M no promises thoughâŚ