Thanks, I understand your 1 st post . It just seems too early to be losing turbo but I don’t know. That is my question. I’m not to sure of the math . I suppose with a regulated output, the lumens can’t just drop off . That would make sense . At 3.7, it can no longer make 2200 lumens.
This is why after 2 1/2 years of Elect. Tech. I chose another career path.
Thanks Jason. Yeah, I tried that and nothing. I contacted seller awhile back and they said they would ship a replacement. I’ve asked them twice if they’ve shipped the replacement but nothing but silence. I just opened a dispute with AliExpress.
If it was just for myself to play with there’s no concern. I just don’t want to buy in bulk and have to thoroughly test each one before selling it. When getting my own branding it’s 50pcs per model. The lack of reviews on the SP33 and the few people that received them, some have issues so I’ll hold off until the bugs are sorted. It’s $8.70 USD per KG shipping to New Zealand. Shipping costs a lot more as I purchase bulk cells too using an express service.
I’d also be bundling the Sofirn 26650 and it’s unclear how long it’ll last on Turbo since no one has tested? I don’t really want to import other 26650’s just for longer Turbo as it’ll up my prices and I don’t really want to go that route
Remember that a resting voltage of 3.70 is pretty much a dead battery. I usually recharge them or swap them out once they get under 3.8v.
I’ve found that my lights tend to go from 4.2v to about 4.0v pretty fast then spend forever going from about 4.0v to 3.8v. Then once it gets to the 3.7v range it’s weak and the voltage starts dropping pretty quick again.
When it comes to boost drivers, as the voltage drops, the driver has to pull more amps from the battery. There is always going to be a cutoff point where the driver designer has to limit the current to keep from burning up the driver.
Some boost driver lights will give higher output, let’s say 3,000 lumen, but they will have to reduce the output sooner. So they may loose turbo at 3.9v for instance.
The Acebeam EC65 is a boost driver light that does a measured 3750 lumen, but it can only do it for about 1 minute! After that, the factory battery voltage is too low (too much voltage sag) and you only get a reduced output of 3000 lumen. This is an extreme example.
The SP33 is a more conservative example that does 2200 lumen and can maintain this all the way down to 3.70 volts. I like this strategy. It makes for a much more practical light.
A couple people have tried the Sofirn 26650. Their 5500mah model seems to measure closer to 5200mah and their 5000mah seems to measure closer to 4700mah. This was measured on typical battery chargers that measure capacity so not super exact.
It seems like the more current reviews show the capacity closer to spec.
Their internal resistance is a bit high. They are not high drain cells and don’t produce high output in FET driven lights. Since the SP33 seems to have a set voltage that determines when it looses Turbo mode and not a set current limit, I’d say their 26650 cells should be fine to use in the SP33.
I wish we had some better reviews of their batteries.
Maybe I should buy 2 of the 5000 and 2 of the 5500 to test out?
I’m getting a better understanding of how the driver works now. It’s quite a decent driver when comparing to Direct Drive. At 3.7V on direct drive the Turbo may only be outputting 920 lumens for the High mode on this boost driver. Just because you can access Turbo on a Direct Drive doesn’t mean it’s outputting that brightness. At least you know on the Boost that it’s outputting a set amount or close to it
A FET driver, or direct drive, connects the battery directly to the LED. This means the output slopes down as the battery voltage drops.
With a boost driver, the output looks like steps. It gives steady output to a certain voltage or current, then steps down to a lower, but steady output.
They each have their pros and cons.
A FET driver is capable of higher output initially, but then steadily declines. It’s easier and cheaper to build, but requires the right battery and emitter combo.
A boost driver can have a lower, but steady initial output which can be set at the factory. This means less heat and less battery drain. It’s more expensive and complicated to build, though.
You can’t even run an xhp50.2 with a FET driver. It will draw too much power and burn itself up. With a boost driver, such as with Lexels and Richards (MTN E) boost drivers, you can set the current limit for the emitter by changing resistors. Let’s say you want a 3A turbo limit for a xhp50.2. That would probably draw 7A to 8A on the battery. As battery voltage drops, the current will go up (in Lexels and Richards design). Then say at 15A on the battery, the driver will have to step down the output to keep from burning itself up.
This lights are lack of inventory in our factory warehouse and when it is restock we will send the batch to amazon us. We will let you guys know when it is available on amazon and offer a nice price at time time.
I never said my switches had “issues”, I said they were “finicky”.
As it turns out the majority of the “finicky” part was ‘operator error’. . :person_facepalming:
The ‘short clicks’ need to be fast & crisp. The ‘double clicks’ to Turbo must be quick & fast.
Doing it that way my SP33 has been working like a champ!! :+1:
I am beyond pleased with it. . :+1:
I hope at some point they will do one with a ‘ramping mode’.
Mine do not have the ‘Eco mode’ issue Streamer has mentioned.
The SP33 is a great light at a great price as far as I am concerned. :+1:
Yeh, an occasional flaw in products is to be expected. It just sucks when it happens to you. Not to worry though…
The driver flaw in my copy was disappointing for sure, but thanks to Sofirn for handling it so speedily for me. That said, I can’t wait to get another copy of this light when they hit Amazon.
It’s that nice of a light. And I love the size of the 26650 battery tube in hand with this thing. Gotta have another… .
My bad, yes on the SP33. I should have been more clear, I wrongly assumed since we were talking about the SP33 it would be implied. :person_facepalming:
I have edited the my original post & the quote above to indicate I was referring to the when hoping for ramping in a future model of the SP33.