What I meant was the reel, what was on the reel? The 3000k or the 4000k ones?
I also don't know if I get this right, but the forward voltage is higher than other LEDs but its more efficient than 219c by about 30%? What does that mean?
Does it mean that it requires more voltage to turn on, yet it uses less energy once it does so?
If I am reading that correctly, the voltage of the battery will affect the duration of the flashlight's usage. As the battery power drops in voltage, it will stop working before a lower fV led would, but it will take longer to get there. Am I stating that correctly?
There's a direct relationship between battery voltage and state of charge.
In this particular case, a relatively higher Vf led won't stop working before a lower Vf one. For unregulated drivers this just means current reduces, Vf does too… and the torch keeps producing a good deal of light anyway. In case of unregulated (MOSFET and such) drivers actually higher Vf leds result in longer runtimes and higher working efficiency. For regulated drivers it's a bit the other way round, keep in mind that for any given current higher Vf means higher power output, with pretty constant efficiency in this case.
I expressed interest here (#40 on your list). I don’t mean to rush anything but I don’t know who’s now in charge for the next step. Are you now waiting for payment from me or do I need to wait for further instructions via PM from you before I send the money? As there were some discussions about Paypal fees (commission, currency exchange, bla bla) some pages before I don’t know if your prices in the first post of this thread are the final prices that just need to be added up. Can I use PayPal for goods and services or are your prices calculated for “friends and family” only? Any hint would be greatly appreciated. Thank you!
In my test of the 70cri 351D it did not even make peak lumens until 4.2v. So there should not be any worry about killing it with an FET driver if it is well heat sinked unless the 90cri version is much lower vF.
Sorry guys I was very busy during last two weeks. I have enough LEDs for all who now in the list.
So if you dont have a questions and request, you could not wait my PM and pay to my PP address andreyderbishev@yandex.ru according price in the top of first message
351B 3000K 90cri are available. Price
1-49 0.55$/pcs
>50 0.50$/pcs (including PP fee)
351D 4000K 90cri will be available in a week.
Price
1-19. 1.7$/pcs
20-49 1.6$/pcs
>49 1.5$/pcs
351D 5000K 70cri on order
Price
1-19. 1.7$/pcs
20-49 1.6$/pcs
>49 1.5$/pcs
Shipping 5$ All prices include PP fee.
You should use “for goods and servises”
And make sure that you send $ (or euro according ECB rate) not RUB
In comment in PP please write your BLF nickname.