Recent content by anuragwap

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  1. anuragwap

    Finding true cyan LEDs

    Off topic, but just noticed that DTRLPF now has 55mW 490nm Sharp diode lasers in his website for $50, they do 160mW when pushed.
  2. anuragwap

    Nichia introduces violet pump based ultra high cri mid power leds

    They finally made the switch! (http://www.nichia.co.jp/en/product/led_sp_optisolis.html) Maybe Prof. Nakamura at Soraa was right to say that violet pump leds will eventually take over blue pump ones. Their new series is named Optisolis. From the datasheet, it has a peak at 420nm, does not suffer...
  3. anuragwap

    Finding true cyan LEDs

    If you want to go the luxeon rebel way, see TCSS (at the bottom, they say all their cyans are bin1), but do contact them beforehand to make sure if they are indeed bin1. If you hate their steep price (I do), order some cut tapes of 'lxml-pe01-0060' from mouser/digikey/future and there is a very...
  4. anuragwap

    Finding true cyan LEDs

    Cheap 3535/XPE styled 'epileds' 490-495nm cyans when mounted on DTP copper boards, driven at 1 amp and properly heatsinked, blue-shift noticeably more my bin1 luxeon rebels mounted on sinkpad mounted on oversized ohmite heatsink. I don't have a spectrometer, but I guess the color is very close...
  5. anuragwap

    Convoy S2 Build How-To (First time builder)

    Thanks for the detailed guide Jbraman. I'm about to build my first serious flashlight using S2+ host from banggood. Wanted to share that a small pair of scissors (the sub $1 Chinese ones with plastic handles, blunt tips) can be a very good alternative to snap ring pliers for unscrewing the...
  6. anuragwap

    Trying to find a blue-green wavelength LED

    Anders, it can be done just to see the beautiful argon laser-like cyan color, but keep in mind that efficiency will be horrible due to droop of green/cyan LEDs. Just have a look at the Lux rebel datasheet, see how lumens eventually max out with increased current drive. (Blue/Royal blue are...
  7. anuragwap

    Trying to find a blue-green wavelength LED

    Thanks for the suggestion! But 5-7 amp to that small die? How much V_f are we talking about at that drive level, supposing junction temp is kept under control by setting low enough duty and good heatsinking? (And I feel 5-10% duty will be too much) I love my bin1 cyan rebels too much to try...
  8. anuragwap

    Trying to find a blue-green wavelength LED

    Anders, like you I've also tried those 'ice blue' chinese LEDs with green phosphor and have been disappointed. (Their color saturation is very low because of the mixing of blue and wideband green emission, they look more like a bluish white than cyan). I've also tried 490-495nm dominant LEDs...
  9. anuragwap

    Host suggestions for a rebel based light

    Hello, For a long time I wanted to build a flashlight that will run from single 18650 using 1. bin1 cyan luxeon rebel reflowed on 20mm Al sinkpad star. 2. 8degree LEDIL optic (21mm dia), which IMO gives a very nice round beam with little artifact and no side-spill. I also want decent...
  10. anuragwap

    LED strip lights for aquarium

    Also try out the Chinese sellers from ebay.com, they generally send LEDs in small envelope (if you order in small quantities) which are not checked by Mumbai customs. I get my stuffs from China within 2 weeks this way. (I use ICICI bank's debit card which works with PayPal, some other bank's...
  11. anuragwap

    Cheap eBay 3W LED - Forward Voltage

    I've some experience with these generic LEDs (most problably w/ Epistar chips). No way on earth their V_f would be as high as 4.5V at only 250mA (unless they're using dies meant for 5mm LEDs!). In my experience, they're about 3.6V at 700mA. 0.5V is only the overhead for CAT4101, if anything...
  12. anuragwap

    Cree introduced photo red XP-E LEDs

    Well, photo-red is Cree's name for 650-670nm peak deep red LEDs that are supposed to help in photosynthesis /used in horticultural application along with royal blue LEDs. Apart from that, the true red color of 660nm is aesthetically more pleasing than the orange-red 630nm to some people...
  13. anuragwap

    Cree introduced photo red XP-E LEDs

    See the updated XP-E datasheet http://www.cree.com/~/media/Files/Cree/LED%20Components%20and%20Modules/XLamp/Data%20and%20Binning/XLampXPE.pdf Since Cree XPERED-L1-0000-00801 ordinary red already has awesome efficiency, I was expecting the photo-red XP-E's efficiency to be much more than deep...
  14. anuragwap

    Some more circuit theory (PWM theory)

    If you want 2 sided boards, OSH Park's rate is only $5/sq inch for 3 copies of the board. I've ordered twice from OSH in the last 6 months and the turn around times were 15 and 21 days.
  15. anuragwap

    Making Your Own RGBW LED From Individual LEDs

    I've read horror stories about Polymer 230 optics at aquariumreefledlighting.com (unfortunately its down now). Apart from flimsy construction, the user reported poor color mixing and poor light transmission, as significant angle of view of the LEDs was obstructed by the surrounding plastic. So...
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