Bloomin' lumens

[Scimitar]

UltraFire 9T6 (with 9 x XM-L) Review (2-3x 18650 or 26650)

An illuminating look at the claimed 7200lm (or is that 9000?) 9T6 from DX. For real, it's still a massively bright torch, not quite the output it claims though, and that's why I like to know the factor to de-rate makers' claims by.

 

[oigoi]

You mean the bullsh*t quotient? I usually find if you halve someones claimed figure you wont be disappointed

 

[Deleted member 4366]

UltraFire 9T6 (with 9 x XM-L) Review (2-3x 18650 or 26650)

An illuminating look at the claimed 7200lm (or is that 9000?) 9T6 from DX. For real, it's still a massively bright torch, not quite the output it claims though, and that's why I like to know the factor to de-rate makers' claims by.

Good find. There's a link to a lot of very sensible bike llight reviews as well.

 

[Jeremy]

As we discussed in another thread here on lights, pretty much every seller of these things outside the EU (and so unaffected by EU legislation on the description of goods for sale) massively exaggerates their claims.

I always tend to look back at the LED data sheet and work back to get a better estimate of the probable light output, taking account of the challenges in getting heat out of the LED die in practice. This gives a better guess at the maximum a given light might put out, but doesn't take account of the other lies the manufacturer/seller might be telling. For example, often these things don't even use the named LEDs they claim to. If you add up all the lights on sale that claim to use Cree LED dies you'll find that it exceeds the actual output from every Cree production line added together............

 

[Cakey]

In fairness that is still one hell of an output for a torch . Olight x6 is a monster at 5000 lumen . But is not a pocket job

 

[NRG]

No doubt some of the massive claims on these lights should be taken with salt but I wouldn't take the results of the tests on the link above as Gospel either, the DIY test rig was only 'calibrated' (an averaging calibration as well) up to 1500lm...still it is a good reference point all the same.

 

[NRG]

....to add to that Lumens are a bit of a waste of time for comparison, Lux should probably be used as this is what we 'see' when a torch lights up a road. Beam spread / angle and distance then all play a part.