[deleted-200707]

I feel better.
Not sure I should.
Hell W/it!

[SKV89]

@adam7027

I was struggling to hit the trigger or not, but as new options and developments emerges, I think I cannot resist keeping an eye on this flashlight.

My main concern was the body size. At first time, it sounds nice to have an 5000lm ~95CRI flashlight, but I have read, that it can sustain only 700lm. I would have been happier, if around 950-1100 were possible - but I guess, this is because the 219B LEDs generating more heat, than e.g. XP-L HD.

When a BLF Q8, and this flashlight reaches the sustainable stage, how do they compare?

I will be curious about the new emitter choices’ performance (mostly SST20 4000K) as well.

The SST20 should be brighter but not sure which tint bin it is. I’m guessing it’s the same one Kaidomain is selling and the tint bin is above the BBL so it is kind of greenish/yellowish like the 219C and LH351D. It will look nowhere as nice as the 219B 4500k, which although has less lumen output, you actually see details and textures better because of the tint and CRI. I think the 219B ROT66 is the perfect tinted flashlight everyone should keep in their arsenal as a benchmark for all other flashlights.

[JasonWW]

@adam7027

My main concern was the body size. At first time, it sounds nice to have an 5000lm ~95CRI flashlight, but I have read, that it can sustain only 700lm. I would have been happier, if around 950-1100 were possible - but I guess, this is because the 219B LEDs generating more heat, than e.g. XP-L HD.

I think you have your numbers a little bit mixed up. I don’t believe anybody has measured what the highest sustainable brightness level is. It could very well be a thousand lumen, we don’t know yet. The 700 lumen number is in reference to the highest regulated mode. Meaning the highest output the light will run on only the 7135 chips. This is separate from the highest thermal level.

[hunter1]

Received my black XP-L CW and my champagne Nichia today.
Both in perfect condition.
Thank for the GB.

[deleted-200707]

No joy here!
One XP-L is dark.

[adam7027]

@JasonWW

@adam7027

My main concern was the body size. At first time, it sounds nice to have an 5000lm ~95CRI flashlight, but I have read, that it can sustain only 700lm. I would have been happier, if around 950-1100 were possible - but I guess, this is because the 219B LEDs generating more heat, than e.g. XP-L HD.

I think you have your numbers a little bit mixed up. I don’t believe anybody has measured what the highest sustainable brightness level is. It could very well be a thousand lumen, we don’t know yet. The 700 lumen number is in reference to the highest regulated mode. Meaning the highest output the light will run on only the 7135 chips. This is separate from the highest thermal level.

I think, I had found the correct source of data ---> maukka's review.

There you can see a graph labeled as 'Max output, no fan'.

[JasonWW]

@adam7027

@JasonWW

@adam7027

My main concern was the body size. At first time, it sounds nice to have an 5000lm ~95CRI flashlight, but I have read, that it can sustain only 700lm. I would have been happier, if around 950-1100 were possible - but I guess, this is because the 219B LEDs generating more heat, than e.g. XP-L HD.

I think you have your numbers a little bit mixed up. I don’t believe anybody has measured what the highest sustainable brightness level is. It could very well be a thousand lumen, we don’t know yet. The 700 lumen number is in reference to the highest regulated mode. Meaning the highest output the light will run on only the 7135 chips. This is separate from the highest thermal level.

I think, I had found the correct source of data —-> maukka’s review.

There you can see a graph labeled as ‘Max output, no fan’.

I’ll try to explain that chart to you.

In Maukka’s test he did not try to find the brightest level that was sustainable thermally. What he was showing is the thermal stepdown levels. When you start at turbo and the thermal limit is reached, it drops down to a set level (50%?). Then if it doesn’t start cooling down it will step down to the next step which is the all 7135, no FET step (700 lumen). At this point the temperatures don’t go up again.

This does not mean 700 lumen is the highest sustainable brightness level. To find that, you would need to set the light to an arbitrary level, say 1000 lumen and then see if the thermal protection will activate. To my knowledge, no one has tested this.

Also keep in mind that ambient temperatures, the amount of air flow and whether or not your holding the light also play a factor in the max sustainable brightness level.

[adam7027]

@JasonWW

I’ll try to explain that chart to you. In Maukka’s test he did not try to find the brightest level that was sustainable thermally. What he was showing is the thermal stepdown levels. When you start at turbo and the thermal limit is reached, it drops down to a set level (50%?). Then if it doesn’t start cooling down it will step down to the next step which is the all 7135, no FET step (700 lumen). At this point the temperatures don’t go up again. This does not mean 700 lumen is the highest sustainable brightness level. To find that, you would need to set the light to an arbitrary level, say 1000 lumen and then see if the thermal protection will activate. To my knowledge, no one has tested this.

Thank you, now I understand. The labels of the graph tell me, that on 700lm, the temperature is still starts to slowly rise to near 60°C - so the sustainable level is certainly above the ‘all 7135, no FET’ setting (given the choice of Tmax=65°C), but not significantly (maybe it is at 800-830 lumens, I guess). The numbers I looked at, really needed some clarification.

@JasonWW

Also keep in mind that ambient temperatures, the amount of air flow and whether or not your holding the light also play a factor in the max sustainable brightness level.

For now, I assumed stationary air, and ~25°C room temp - I know that the above mentioned factors can alter the readings.

I just partially invalidated one of my concerns against buying this light, lol :person_facepalming:

[JasonWW]

I guess if we wanted to be practical, and not too technical, we could say about 700 lumen is the thermal max. It would be tricky to find that level in ramping. You have to watch the light switch blinks. Maybe just set it at 1000 or so lumen and after 20 or 30 minutes it will step down to 700 lumen? IDK. Maybe. You can give yourself a headache trying to figure all this stuff out. :confounded:

[deleted-200707]

This is Epic Customer Service! No BS, No Vids, No store credit, No ship to China!
I did include pics of the package, box, and the dead led.
I hope these people stay around and make more lights. I’ll buy them.
It was less than 3hrs for them to reply.

Yes, please send it to vihn.

Return address:

Vinh
(address)

As soon as vinh receive it, we will send you a new light.

Best Regards!
Jack

FF-light@hotmail.com

From: chinooker
Date: 2018-09-06 07:16
To: Jacky chang
Subject: Re: Fireflies ROT66 Shippment US-Express
Jacky Chang
I received my flashlight yesterday. The packing box looked a little crushed but not bad. The Firefly box inside looked perfect.
Unfortunately I have one dead led. It won’t light at all. I love the look of the light and how it is extremely bright.

I am a member (chinooker) on Budget Light Forum and I read that you are having repair work performed in the USA.
I look forward to getting this problem resolved.

Thank You

[nvanlaar]

Is there going to be a new GB for the newer version? Any current discount code Freeme?

[freeme (youtube.com/@1thedeals)]

Not at the moment, but you can get it at a discount with my offer:

Coupon: FFFM08R //// Link: https://freedailydeals.org/product/FireFlies-ROT66

@nvanlaar

Is there going to be a new GB for the newer version? Any current discount code Freeme?

[nvanlaar]

[chooma]

I’m not familiar with SST20 LED’s. There are now 2 options of this led.

What is lumen output and beam like?

Thank you

[freeme (youtube.com/@1thedeals)]

According to https://www.luminus.com/products/white

Product Image	Product Family	Color	Package	Max Drive Current	Optical Output
	SST-20-WxS	5000 – 6500 K White, Standard CRI	3535 ceramic	3 A	900 - 1100 lm (3 A)
	SST-20-WxH	2700 – 4000 K White, 95 CRI	3535 ceramic	3 A	155 – 320 lm (700 mA)
	SST-40-W	6500 K White, Standard CRI	5050 ceramic	5 A	1,400 - 1,900 lm (5 A)

[chooma]

Thank you freeme….

[Mstevens113]

Arrrghhh, really tempted by this, wish there were some published figures for the new led options though. Just don’t know what option suits me best.

[Jay]

Any idea which bin they’ve got for the SST20 4000k and how many 7135 that version will be running?

[freeme (youtube.com/@1thedeals)]

• 9x Nichia 219B SW45K R9080 High CRI Emitters 5000lm R9080 CRI95
• 9x SST20 6500K CW 8500lm CRI66
• 9x SST20 4000K NW 5500lm CRI95

@Mstevens113

Arrrghhh, really tempted by this, wish there were some published figures for the new led options though. Just don’t know what option suits me best.

[djozz]

this one is interesting, detail from Fireflies SST-20 4000K 95CRI chart above:

They measured the tint under the BBL while maukka showed that in his sample of the 4000K SST-20 most situations the tint ends up slightly above the BBL, just at zero degrees and over 4000K the tint crosses the BBL. This suggests that this emitter behaves very favourable in a narrow beam TIR optic