Recent content by TexLite

fenix-store
  1. T

    Someone please explain forward voltage of leds

    I'm not sure if you meant the driver being labeled as CC was crap, or my statement was crap. If the former, then I'd say that "sort of crap" is constantly forced on the public, most of those vendors aren't known for their honesty unfortunately. I've been at this a while, like you, and I've seen...
  2. T

    Someone please explain forward voltage of leds

    Perhaps in certain applications, but I've never seen a muti-mode battery powered LED driver maintain a constant current throughout the discharge range of the battery, most look like this: There are a couple that do pretty well, but the majority that I've seen or used resemble that red line on...
  3. T

    Can I convert 3C XML flashlight to 3 18500 XHP35 or XHP50 ?

    You're welcome. You'd still need a driver, you'd have less than the 1V overhead typically needed for drivers to function properly, especially considering the voltage sag of the cells. Give me some time to get one of my 3C Defiants found and I'll get some measurements. One critical...
  4. T

    Can I convert 3C XML flashlight to 3 18500 XHP35 or XHP50 ?

    Yes and no. Can you convert it? Yes. It is actually a very good host. Large heatsink, it has multiple joints which afford access to all the components, heatsink, reflector, lens, driver, switch etc. The large, deep reflector also throws well. Can you direct drive any of the above mentioned...
  5. T

    Someone please explain forward voltage of leds

    Good explanation by DIWdriver. I'd only add this. The main reason for adding a driver Control. Think about it like this, you have a Metered output that you know will not rise above a Set output current, or an Uncontrolled current that might exceed the LED's current rating and let the magic...
  6. T

    Finally! A $20 USB logging luxmeter

    They're most likely not calibrated for LEDs. I spoke with Extech tech support about this very subject and was told that if I wanted a meter to measure LEDs specifically, they have a model designed for that, that is to say, designed to read the blue in the LED spectrum more accurately. Was quoted...
  7. T

    Trying to source 219b reel

    I thought the NVSL219B had been unavailable since it was superceded by the NVSW219C? Are they still available from Nichia?
  8. T

    4 CREE XHP50 S/P With 4 18650

    Yup, with the appropriate driver should work fine. You planning on using a FET based driver? Linear? CC? There used to be a guy here that posted wiring diagrams for using the 7135 base drivers to drive loads like that, dropping the voltage on the load side like you talking about. I think it...
  9. T

    Can you ID me?

    If you have a way to measure voltage and current, looks like it'd be super easy to put a a high power single die LED in there, something like a Nichia, from the high-CRI NVSL219 product line. They're available for around $5 already mounted on star boards. The new XP-G3's are easier to get now in...
  10. T

    Difference between Cree XM L2 U2 and XM L2 T6

    Yes, that is incorrect. T6, U2 and U3 are Brightness bins, not chromaticity (tint/color) bins. The most likely reason you see T6 Brightness bin and Neutral color or chromaticity together is T6 is one of the highest brightness bins available in most of the Neutral chrom. bins, so they're...
  11. T

    Cree Xp-G3 LED

    Re: Cree Xp-G3 LED ?? Here's an interesting graph illustrating what you're seeing. The graph uses 350 LPW, and as interesting note here, Cree has already surpassed 300 LPW at 5150k, so I suppose it depends on your personal definition of "Neutral". Officially, 5000K and below is considered...
  12. T

    Cree Xp-G3 LED

    Re: Cree Xp-G3 LED ?? Even some "High CRI" LEDs are sadly lacking in their R9 value, which is what you're illustrating. There are a few other bands missing too, but the R9 seems to be the prominent or noticeable IMO. -Michael
  13. T

    P60 head Triple XHP-70

    Nice Work! Quick tip, if you press and hold on the screen while in camera mode, you'll see AE/AF appear in yellow. It's an auto-exposure and auto-focus lock. Not sure if all iPhones have this feature, but I know the 6 and 6S do, I think the 5's do as well. Works great for beamshots -Michael
  14. T

    How many lumens can a Cree XML T6 LED bulb produce?

    I completely agree with the first part, and counterfeit LED's are very prevalent now, however, you're not even guaranteed to get reliable data from some U.S. based light manufacturers. There's a thread running right now on TOF of a U.S. based seller/manufacturer who's claims are wildly...
  15. T

    Help driving Nichia NC4W LED

    Came across this driver looking for a similar project, thought of your "*******" LED lol, if the specs are correct then this driver should work. It only need .9 volts of overhead to remain in regulation, which you have. Plus it's Constant Current as well, which will prevent the flickering or...
See more

Latest posts

Top