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Author Fellows lamps forum.
royfellows

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Posted: 18/03/2020 13:34:53
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I am asking for a general response here, please.

I have to be clear that at this time i have Lynx X_Basic 2s in stock and no immediate plans to discontinue them.

My question however is simply

"If you were considering purchasing a budget end lamp from me, would you consider it worth paying the extra £25 for this one, the Scorpion X, rather than £100 for the Lynx X basic 2"?

All replies and genuine opinion welcomed.

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Moorebooks

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Posted: 18/03/2020 15:36:50
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Roy I have sent a PM re this I would hope others do the same as this string is now 25 pages

Mike
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royfellows

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Posted: 27/07/2020 15:38:02
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Further to my last it appears that the matter has now resolved itself as I have just been advised by suppliers that the aluminium die cast lamp bodies are no longer available!

So sadly, I have to discontinue the Lynx X_Basic 2, the end of 'traditionally' shaped lamps, at least from this shop.

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Roy Morton

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Posted: 28/07/2020 14:20:02
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So it just the ‘under and over’ style now Roy?

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royfellows

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Posted: 28/07/2020 15:06:47
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Roy Morton wrote:

So it just the ‘under and over’ style now Roy?


Yes, I'm afraid it is. But the Scorpion is the best lamp yet, Dragon still going, but it a 'niche' lamp.

The Lynx was based on a Chinese die casting used for a variety of underwater flood lamps, so I am surprised.
I could still get them but not at an economic price. I do have the last 4 shipping, but need them for an outdoor lighting system I have designed. On paper, I can light up all the gardens for 18 watts!


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davel

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Posted: 11/08/2020 19:04:05
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New battery for Roy's lamps?

https://www.theguardian.com/environment/2020/aug/11/powerhouses-nanotechnology-turns-bricks-into-supercapacitor-batteries

I'm not sure this technology is quite ready for underground use though - it might be a bit heavy for a helmet-mounted battery. Smile

Dave
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ChrisJC

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Posted: 11/08/2020 19:35:57
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davel wrote:

New battery for Roy's lamps?

https://www.theguardian.com/environment/2020/aug/11/powerhouses-nanotechnology-turns-bricks-into-supercapacitor-batteries

I'm not sure this technology is quite ready for underground use though - it might be a bit heavy for a helmet-mounted battery. Smile

Dave


I think I'll wait for nuclear fusion to become a reality. After all, that's only 30 years away...

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crickleymal

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Posted: 26/10/2020 18:43:20
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So who is the go to supplier for lamp internals nowadays? I used to use Dealextreme or Kaidomain but looking on Trustpilot they're both getting awful reviews this year.

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royfellows

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Posted: 26/10/2020 18:57:21
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I buy very little from China nowadays, my main supplier is Premier Farnell followed by RS Components.

From China I get my LEDs from Fasttech, also GoPro components, reflectors and heatsink strips which have to be cut and machined.

Advice is electronic components - avoid. For some reason China uses aluminium wire a lot, NG. The fine component wire I use is about 0.6mm, tin coated copper and rated up to 1 amp.
All this is from quality suppliers.

Any electronic stuff I do get from China is stuff I have been buying for years and know is OK.

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Down and beyond

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Posted: 26/10/2020 19:00:45
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I must say the best light I have found on the open market so far is certainly the scorpion x12 Worth it’s weight all day long Thumbs Up

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crickleymal

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Posted: 26/10/2020 19:02:30
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I'll have a look at Fasttech. Thanks

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royfellows

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Posted: 26/10/2020 19:10:01
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Down and beyond wrote:

I must say the best light I have found on the open market so far is certainly the scorpion x12 Worth it’s weight all day long Thumbs Up


A kind remark, it is probably the best all rounder I have produced yet. The user friendliness is what rounds it out, each switch position holds memory of last setting so you just flick from one to the other. I love that bit.

I have sold a lot lately which has held up announcement of the X16, plus I wanted to get the mountings done so all ready for any orders. But X12 still best all rounder.

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Down and beyond

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Posted: 27/10/2020 07:45:25
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Scorpion x12 short review
Have added the name above incase anyone does a forum search for feedback .

All the people I have met who enjoy taking quick photos on there phones love the settings set up I think this is a very strong point on the lamp itself as you have a lot walk modes , it’s definitely my favourite part of it as it has stored my personal walk setting now I just flick it up click phone picture done flick down walking again , anyone with a armtek v3 are still finding the correct setting and your already finished it’s so fast even on a decent walking pace trip you don’t fall behind , love how solid it is has took some heavy bashes been caped in the red mud at fod iron mines, battery never has dulled on me at all . so a 12/10 review from me Thumbs Up

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royfellows

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Posted: 28/10/2020 15:45:52
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Scorpion X16, well here it is!

The scorpion X16 is a 16 volt, high performance, high efficiency, sealed rechargeable caving and mining caplamp. And is the latest in the long line of Fellows batcookers and the best one produced to date. It has been developed over the last two years or so and presented quite a few challenges. These lamps are only produced in small numbers, as a sort of ‘flagship’ product, with the appeal being to a niche market of either photographers or people who get a kick out of strolling through roomy slate mines.
Big issue with the earlier lamps was the tendency for a user to be that busy in taking photographs that they would forget that the lamp was on full power, and good as gold it was always the floodlights that failed. This lamp has been designed with one eye on that situation, and the realisation of what a fantastically good heat sink platform the scorpion lamp actually is.

The concept was born of the realisation that the best compromise between size and weight to capacity for a helmet mounted power bank is 4 X 18650 cells, and that if in series to give 16.8V off charge these can power the latest high forward voltage quad die emitters from a simple buck circuit and utilize readily available laptop computer components.

Some inspiration was taken from the Imolent range of torches, such as laptop computer 19V charging, overdriving Cree XHP 35 emitters at 1.5 amps to give about 2200 lumens, and that the XHP 35 is possibly the only quad die emitter that is focusable into a tight beam with a 20 X 20mm reflector.
The lamp is based on the now proven Scorpion design model which does not suffer from earlier lamps tendency to burn floodlight emitters due to the fact that the heat has only 10mm to travel to ambient. It is also fully GoPro compatible as other Scorpion lamps. Also, reference above, is the best heat sink platform to date.

It utilises the 2 switch operation of the earlier Lynx ‘batcookers’ whereby the right hand switch ‘down’ operates beams through three modes, while ‘up’ gives a pilot. However the upper throw is now called “Ecodrive” rather than “Pilot”. The left hand switch ‘down’ position operates bare flood emitters through 3 modes and upper throw actuates the blue nightrider battery level indicator. That much is possibly true to form, however the specs differ widely from its predecessors.
The internal layout as seen through the glass follows the established over and under design of the Scorpion, however careful examination of the beam emitters will reveal that they are actually quad dies. Cree XHP 35s as mentioned above, to be precise. These are overdriven to 1500 mA to produce a maximum output of over 4650 lumens. Crees recommended maximum is 1050 mA, however many established torch manufacturers such as Imolent are over driving these emitters to 1500 mA. I have always been against the very idea of overdriving, but it made me think when I discovered that Imolent were doing this in their XHP 35 based torches.
I have performed lab experiments were XHP 35s have been driven for days at double the recommended drive current, albeit with massive heatsinking, which is what it all appears to be about.
Obviously, burn times on full power will be brief. The lowest setting, “Standard Mode“is about 300 lumens and the battery pack will sustain this level for about 25 hours. Actual tests have produced 27 hours after which the lamp goes into a ‘slow death’. This is because the forward voltage of the emitters at lowest light levels is still greater than the power pack switch off voltage level.
The alternative Ecodrive utilises two Cree XPG 2s which my testing has confirmed give best bang for bucks at lower drive currents and best beam pattern through small reflector or optics. Output is a single mode of about 160 lumens sustainable for 2 days, or an estimated 50 hours to be precise.

The 4 bare emitter flood lights are Cree XPLs driven in series at 3 amps maximum to give 4600 lumens, plus the two lower settings. Lowest is about 120 lumens and can be combined with either Ecodrive or Standard Main Beam to give a very pleasant overall lighting effect.

Maximum power is achieved by combining beams and floods at full power to generate over 9200 lumens.
The lamp handles the heat generated extremely well, and there is an overheat alert in the form of a flashing red LED to alert you to this condition. This is set into the bottom of the lamp directly above the eyes of the user; you would have to be pretty blind to miss it once it starts flashing.
This is set to a modest 65 degrees C, so you have time to finish whatever you are doing, photograph or whatever, before switching down to allow the lamp to cool. I recommend a ‘window’ about 5 or 6 seconds.

The weight of the lamp is typically 237 grams. This compares to weight of an Oldham pitlamp of 200 grams, Scurion of 160 (without rear heatsink), Stenlight of 125, Earthworm about 245 (manufacturer states “less than 250”), or my old MagnumStar of over 400. No kidding.

The power pack is an unusual design and comes from a minimalist objective to keep down weight, whilst allowing enough room for the 16 volt laptop computer electronics. It is of 3000 mAh capacity at the nominal voltage of 14.4 volts which equates to 4320 Watt Hours. This is just marginally less than the Lynx X12 20170 celled power bank of 4700 WH as described by the cell manufacturer. However these cells are actually tested at 4000 mAh @ 3.7V so the true capacity is 4440 Watt Hours.

The 16 volt design is a good solution to driving the 2 parallel XHP 35s from a simple buck circuit whilst utilising the fact that 4 X 18650s is really the most power one can comfortably wear on a helmet.

The X16 power bank weighs 370 grams which is lighter than the Lynx X12 power bank of 400 grams. Comparison is Scurion 4 cell aluminium power bank 311 grams. It fits by a new helmet mounting which is of thin PVC so as not to add bulk but acts as a template for the screw holes. Power bank is locked in by a tagged silicone strap which holds it tightly.

The lamp has a one piece cable, so no plug to allow water ingress on prolonged submersion. The battery cells are thin aluminium cased over an internal thin plastic separator and has an anti explosion device set back in the far end.
The cells are Samsung INR 18650-30Q 3.6V 3000mAh which are same as used in the Imolent DX 80 torch of 32,000 lumen output. They are managed by an S-8254A Series chip based laptop computer battery management PCB which is an off the shelf product. There is a flashing on charge red indicator LED operated by an LM 393 comparator circuit using logic from the 8254A’s no 1 Pin, the FET open gate connection for charge control. This circuit is isolated by a Schotky diode from battery feed and will only operate on charger input. The 8254 controls 2 X quad MOSFET arrays, one MOSFET to each cell for both charge and discharge. Discharge cut off is 2.7V per cell, charge is of course 4.2V per cell.

There is an isolator switch within a protected shield with a transport lock split pin to prevent accidental activation of the lamp. The switch alternates between the lamp on and lamp off/charge. The charging jackplug is exposed by unscrewing the 10 BAR rated plug. Whilst charging a red charge LED will flash on and off, charge complete is signalled by a bright green (gallium nitride) LED.

The lamp is supplied with 19 volt laptop mains adaptor, but can be charged in car by use of either an inverter or a 19v laptop or phone inverter charger provided the charge current does not exceed 4 amps. The lamp can also be safely charged from a 16.8 volt dedicated Li Ion charger which has its own red to green LED. However, the lamps built in charge indicator will continue to flash after charging is completed as the cells will be very slightly undercharged using this device. (Vf drop on the Schottky). Top up charging is OK as with any Li Ion battery setup as these do not suffer from memory effect. The on charge LED circuit is isolated from the battery cells and is entirely dependant on charger input again utilising the ubiquitous LM 393 comparing a thermister shunt to a fixed voltage reference point.

Operating the switch in the downward direction brings the lamp on line, a blue LED illuminates on the side of the power pack to indicate this. This light draws only 3 mA, again utilising a gallium nitride emitter. This LED can be safely covered with a bit of tape if the wearer is posing for photographs.
The design of the lamp is such that the cable is easily replaced. A new battery bank would be cost effective for the customer as all the circuits etc can be transferred to a new bare unit.

The lamp has been tested to 8 feet for some time, but is not offered as suitable for diving.

This lamp is probably the most advanced piece of kit I have produced to date and is absolute magic to use. The effect of the 4600 lumens of flood lighting on your head has to be experienced to be believed. The beam is extremely well focused and has enormous throw. Early experiments with Cree XHP 50s were a dismal failure; output was not a nice beam but more of a huge light dollup. Life changing experience was the discovery that XHP 35s can be safely overdriven.

I suspect that Cree’s recommended maximum outputs are in part ‘political’ as the XHP 50 is a pig in the middle
On full power the lamp is surprising slow to get hot, this is obviously a product of the basic design of the Scorpion lamp which is better than anything previously produced.
The beam emitters are mounted directly onto the back of the lamp so heat passes directly into the rear heatsink. The bare emitters are on copper and the thermal path to the side heatsinks and ambient is about 10mm only. This is a feature of all Scorpions. Using the lamp for photography it is easy to forget that something is on full power, I have done this, but the little flashing red beacon soon alerted me to the fact that the lamp was getting hot.

I expect this lamp to give its users a lot of pleasure.

The lamp is supplied as kit. The “all in one” lamp assembly. 1 X 19V mains Laptop charger, helmet mount and GoPro accessory kit. £395.



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ttxela

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Posted: 28/10/2020 16:15:21
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Well that is a very nice bit of work there Roy. I'm pretty tempted but the Magnumstar is still going strong although the switching between modes is becoming a little tempramental.

I use it for quite long periods on full power for video purposes, definitely longer than 5 or 6 seconds. It seems to cope well with it though Thumb Up
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Down and beyond

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Posted: 28/10/2020 16:20:03
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Am hoping to see one in action underground soon Roy ! Will you be using this from now on yourself ?

Does look very nice I have to say !

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royfellows

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Posted: 28/10/2020 16:40:32
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The 5 or 6 seconds is a 'window' from when the red light starts flashing, the time before this happens will vary on lamp temperature to start. A cool lamp even with everything on takes several minutes to heat up.

I have been using mine as lamp of choice for about 18 months, unless I am working, then I prefer my old lightweight Dragon.

I also still have the original X12, would not want to part with that.

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ttxela

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Posted: 29/10/2020 09:16:24
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Ah, I see.

It is easy to forget you are on full power and just wander about happily in the 'daylight' especially if you are on your own.
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Down and beyond

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Posted: 29/10/2020 09:48:09
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I agree easy mistake to make I find my switch on my lamp only reason I don’t do it as click it up photo I no as soon as I took photo down only reason I remember, with my old torch the button setting holding it while it changed and going through it’s options use to do my head right in ...

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royfellows

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Posted: 29/10/2020 10:34:00
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Re the X12.
I think its impossible to improve this lamp, but I am looking at the battery side. A sealed rechargeable version would be good, but any design like that needs an isolator switch.
On the TGX this is done electronically, however my preference is mechanical switching as in the X16, not forgetting that whatever used has to be waterproof.
Also I need to avoid any price increases on the run of the mill lamps. This X16 is the most expensive yet, but in truth, a lot of work goes into them and I question the economic viability anyway.


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