Table1) Specifications

1)Vortex XR-1	2)Vortex TR3	3)LED Lenser LL7459	4)Vortex CR-2	5)TigerLight GOLD	6)Streamlight Ultra-Stinger	7)Vortex DR-2	8)DR2 Instruments 6V Rechargeable

Table 2)Ease of Use & Charging Details

Description
The Vortex Vision DR2 is an alternative to the classic benchmark flashlight of a similar form factor. The DR2 uses a unique switch cover and charging occurs either through a direct connection or indirectly via a charging cradle. As is customary with many such lights, a 12V DC cigarette charging adapter in included in the package. The DR2 has the solid heft and balance that one expects from a light of its size and it sports the same type NiCad battery pack that the other '3-D' size flashlight uses. One advantage of owning a DR2 is that its lamp uses a PR type base, making emergency substitution much easier that if were designed to use a bi-pin lamp. The DR2 would make an excellent duty light for police and security use.
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Sales Source:http://www.vortexvision.com
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Specifications for:

• Dimensions:L= , Head Dia= , Body Dia =
• Net weight: gms / oz
• Colors: Black Hard Anodized II
• Composition: High strength aluminum, Acrylic + other
• Bulb type: Vortex 10W Halogen PR base
• Average Bulb Life Expectancy:
• Battery Type: 6V NiCad
• Top-Off Charge Time:
• A/C, Current requirements:
• DC, Current Requirements:
• Run-time (duration) to 50% of Maximum Brightness
• Accessories Included: Charging Cradle + A/C (USA or Country Specific) & D/C 12V Cigarette Plug, Instructions
• Optional Accessories: spare batteries & bulbs

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Evaluation Results & Summaries

Ease of Use
Very Good. The user simply locates and depresses the click On/Off switch button to turn the light On and Off. A partial pressing allows for momentary On activation. Rotating the helical screw head allows for adjustment of beam angle from a spot to a wide-angled beam. Battery replacement simply entails unscrewing the tail piece in exactly the same manner as if one were replacing batteries on a standard DR2 lite. Charging simply entails a firm push of the light's neck into the dedicated cradle. An indicator light signals that charging is taking place. Because the tail-piece is flat, the light may be stood upright for a ceiling bounce style of illumination indoors. In most cases, the light may be stowed head down on a flat surface or it may be carried in dedicated belt accessories designed specifically for that purpose. In addition, subtle longitudinal grooves cut into the head somewhat mitigate against a run away light rolling along a smooth surface when laid down horizontally.
4.75 points
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Task performance optimization
Very Good. The DR2 provides a practical source of bright hand-held illumination for contexts that demand a combination type beam that is able to pinpoint a subject at distances from a couple of meters to nearly 200' as well as provide a broad disc of context revealing illumination that makes such lights a perennial favorite for navigation, search and tactical applications. Being of formidable length, heft and weight, the DR2 also doubles as a nightstick or club for defensive or police applications. Because it's rechargeable, the astute user may always have a substantial amount of brightness and runtime at their disposal and at a moment's notice, Because batteries are charged while inside the lights, repetitive removal of batteries is unnecessary- eliminating a potential source for risk, wasted time and component loss.
4.75 points
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Documentation Quality
Satisfactory. The instruction booklet is Quadri-lingual for English, Spanish, French and German reading customers. It's written and illustrated in precise, concise and professionally laid out step-by-step sections that enhance optimal information absorption and that minimize mistakes. Typographic font size is much smaller than average size , making it difficult for persons with poor eyesight to read.
3 points
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Battery Charging (Ease, Frequency, Maintenance)
Excellent. Based on a procedure described in the instructions, the charging set-up and procedure are easy. Frequency of charging will depend on the user but since the manufacturer recommends charging after each use, the customer doesn't have to monitor re-charge cycles too closely. A caution is made to not over discharge the battery (running it down flat) and to remove the unit from the charging cradle if it hasn't been used in a month. In the past, NiCad batteries required a strict maintenance procedure that involved running the battery down and recharging them fully to circumvent the 'memory' effect. The current crop of NiCad batteries don't require this step. Like most rechargeable batteries however, the DR2's NiCad's do benefit from a few initial charge/discharge cycles in order to 'break them in' for optimized capacity. Careful positioning of the light onto the cradle is required for a solid contact to occur. This is a common feature of all the Vortex rechargeables
4 points
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Balance, Grip-ability, Stow-ability, Tabletop Stand-ability
Good. The DR2 performs in a practical manner to be immediately available to its user whether it's placed head up or tail up on a table, head up in a belt carrier or otherwise stowed in luggage. The vast majority are stowed on their chargers- keeping them topped off and out of the way. The shiny knurled grip surface provides satisfactory traction in most cases but may become slippery when wet or covered with oil. The light balance perfectly at it's midpoint.
4 points
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Items of Note:
The DR2's intense hotspot results in a highly effective illumination of subjects as far as away as 190' - while the smooth wide-angled beam covers a large section of near to far context environment that may surround the intended target. At a distance of 0-40' , it becomes an effective, if less than lethal compliance and defense tool. For workmen and professionals that demand a bright and reliable flashlight, the DR2 is highly recommended. Because the incandescent light produced by its Tungsten filament bulb is a warm 3,400ºK , subjects are more easily seen and paths navigated in darkness- especially outdoors. Though color differentiation at very close ranges is not as perfect as one might experience while using a daylight balance source, the amber tint makes general vision easier for darkness adapted eyes.
5 points

ABOVE,Left- Light in charging cradle | Right-12V DC Adapter (Cigarette Plug)

ABOVE- Detail of bezel removed, showing bulb assembly & reflector housing | RIGHT. PR base bulb

ABOVE- LEFT,On/Off switch | RIGHT, Charging contact

ABOVE,Left- Full-frontal view of head | Right-Direct Beam Shot at maximum spot focus (DBS)