Updated April 2025

TRAVEL INFORMATION

ALL 2 CELL POWER BANKS ARE 26 WATT HOURS (WH)

8V HIGH CAPACITY 4 CELL (BLUE LABEL)  ARE 50.4

8V HIGH DISCHARGE 4 CELL (SAR, RED LABEL) ARE 38.5

12V 3 cell 2070 type (Tesla) are 43.2

12V 3 cell 18650 type are 37.8

POWER BANKS ARE ELECTRONIC DEVICES WHICH CONTAIN LITHIUM BATTERIES, THEY ARE NOT JUST "BATTERIES". THEY HAVE INBUILT PROTECTION AGAINST SHORT CIRCUIT ETC. HOWEVER ROYAL MAIL REGULATIONS CLASS THEM AS "BATTERIES".

We are not responsible for any travel restrictions that may be in force at any particular country.

Watt's a lumen?

To understand the lamps you need to understand some common terms. Amps are the measure of electrical current that flows through a circuit of part of it. The now obsolete Oldham lead acid caplamp bulb runs at 1 amp. Volts technically defined as potential difference or electromotive force can be equated to pressure like the pressure of water in a tap. Turn on the tap the pressure drops and you have a current. Watts* are units of power and are arrived at by multiplying the amperage by the voltage. The standard Oldham caplamp has a 1 amp bulb and the battery is rated at 4 volts, so its classed as 4 watts.

(* Defined as a duration of energy equal to 1 joule for 1 second)

Lumens are units of light, it stands for 'luminous flux', that are actually produced at source, and should not be confused with Lux which is a measure of light falling on a specific area at a specific distance. The Oldham lead acid caplamp produced 48 lumens of light for a consumption of 4 watts. LEDs produce a lot more light, a Cree XML2-U2 will produce approx 3 times this at 1 watt

Lumens cannot be physically measured and have to be calculated from the LED manufacturers data sheet..

https://en.wikipedia.org/wiki/Luminous_flux

A 220volt 100 watt light bulb produces about 1000 lumens, this is the league we are in with my lamps.

However, lumens do not tell the whole story, second to this in importance are the optics, its no good having a powerful LED if half the light goes to waste. This explains why you will sometimes see a lamp rated at say 500 lumens beat one rated at 600 lumens.

The relationship between lux and lumens is fully dependant on the way that the light output of the LED is managed, this a bare emitter could have a very high output expressed in lumens, but would have a very low lux, equally a miners lamp such as an Oldham DL 16 will have a very high lux for its relatively low lumen of 90 lumens. This is because all of the light generated is focused into a very tight beam.

So if we widen the beam say by 100%, in order to maintain the lux rating and therefore the throw, we would have to increase the output of the LED by 100% to 180 lumens.

BEWARE OF FALSE SELLING

Sainsbury's are a reputable store, their bulb (right) is correctly described. The torch left is described as "32,000 Lumens", they are OK for the money but the output, probably about 3,000 lumens fresh charge, nosedives as batteries go down.

The Scorpion Lamps

This is a new concept in underground lighting. Its unique square 'box' shape allows a diversity of different internal electronics.

The Scorpion Concept

DIMENSIONS: Scorpions are 67mm wide (inc heatsinks) by 60mm high and measure 67 mm approx from front bezel to end of mounting bracket. Individual weights vary, see models please.

The Scorpion X

Similar performance to discontinued  Lynx X_Basic 2 but a bit more power, plus higher waterproof integrity and GoPro compatibility.

This is a low priced general use lamp for anyone, and currently the only lamp in production.

The Scorpion X

£140 plus £8 post and packing total £148

Our Guarantee

All lamps are guaranteed for 12 months from date of purchase. Refunds of postage will be included in certain cases. Lamps are described as waterproof, but not suitable for diving. This does not affect your statutory rights.

Post and Packing Policy and Charges

All  lamps are Special Delivery insured because of the value. 

Ordering a lamp

Check stock level at bottom of this page, if "no stock" please check availability.

Subject to this, its dead simple. We do not require you to open an account, create a username and password, give us your phone number so that you can receive unwanted calls from our 'carefully selected partners', or attempt to take control of your computer. You just send us the money, we send you the lamp. Just like in the good old days.

Amount plus postage to:

R.A.Fellows.

 Green Gables

        Stafford Road.

         Great Wyrley

    Walsall

            WS6 6AX

Cheques to R.A.Fellows please. DO NOT SEND CASH THROUGH THE POST. BACS payments welcome, account details on request.

Please enquire by ordinary email.

Shipping address required in writing to avoid errors.

Sorry we do not reply to emails where doing so enters us into a contractual agreement with third parties or requires us to pay for the privilege.

WE NO LONGER SHIP OVERSEAS.

roy@royfellows.uk