[ti-force]

The Olight SR-91 is a new light that's being introduced into the SR series of lights by Olight. This light was designed to be smaller, and to have an increased runtime over its big brother, the SR-90. I've performed OTF lumens testing and an 84 minute runtime test on this light, as well as included some eye candy .



Specifications (taken from Olight's website):

Luminus SST-90 LED, 30W, lifetime 60,000 hours.

Output & Runtime (manufacturers ratings):
Two brightness levels and strobe mode

1). High Mode: 1500 Lumens / 3.1 Hours
2). Low Mode: 450 Lumens / 10.5 Hours
3). Strobe: 10 Hz / 6.2 Hours

Max throw: 800 meters.
Battery pack: 6 x18650 (7.2v, 6.6A)
Dimensions: Length: 288mm (13.23”) Bezel Diameter: 80mm(3.15”);
Weight: 1196g (With battery pack)

Accessories: Includes one strap, one charger, one operator’s manual, one O-ring, car charger(optional)

Features:

Rechargeable battery pack with built-in 6x18650 batteries (7.2v, 6.6A). Rechargeable socket on the tail
Super bright, modern and novelty design.
Super Strong anti-Reflect coating lens，99% effective transmission
Four indicators on the tail for indicating the batteries condition:

1). 1 indicator on: 20% -40% power remains
2). 2 indicators on: 40% -60% power remains
3). 3 indicators on: 60% -80% power remains
4). 4 indicators on: 85%+ power remains
5). No indicators on means batteries with less than 20% power remains and need charging

Excellent tridimensional heat dissipation ability
Easy touching switch on the head for turning on/off the light and transfering modes.
Special designed charger, Removable and adjustable strap.
Two charging methods:

1). With the whole torch,
2). Only the battery tube

Mil-spec: MIL-STD-810F
Highly water resistant to IPX-8
Anti-shattering ultra clear lens, anti-scratching, anti-slip function.
Tough and rugged body offering firm grip
Advanced digital power management system

Operation:
Press the side button switch to turn the light on.
Press and hold the switch to transfer the output from high to low. A fast double press will active the 10Hz strobe




Now it's time for some OTF lumens :

OTF Readings taken in my homemade IS:
Here are OTF lumen readings of this light. I have a homemade 16" (like MrGman had), but I recently built a 24" integrating sphere like Bigchelis has. I recently built the 24" sphere so I can measure these new monster lights that are being produced. MrGman was kind enough to share his time and knowledge helping me get both of these sphere's set up and accurately calibrated. I'd like to take this moment to thank him for all of his help; without him, this wouldn't be possible. Thanks MrGman


These numbers are as close as you can get with a homemade system like this, but keep in mind that these numbers are what you can expect to see. What I mean is, different variables can cause one light to be brighter than another one, so keep in mind that it's possible for you to purchase one that's not as bright as this one, or one that's brighter than this one. Anyway, enough talking. Here are the numbers:

High Mode:



Low Mode:






Now for the runtime graph:
I will note that this thing gets pretty darn hot when ran on high for this length of time. The head of this light got so hot during the runtime testing that I couldn't hold my hand on the shoulder of the head for longer than three or four seconds. I'm not sure how hot that is, but I'd say pretty toasty. The runtime graph is with the light fully charged and in high mode, and as you can see, the light just shuts off at the end of the runtime. I doesn't turn back on until you plug the charger into the light.









Now it's time for some eye candy :

















Battery level indicator:







The business end : (Also, notice how clear the glass is? I've got to give it to Olight; they've got some pretty clear glass.







The next two images were also taken with the glass in place. Did I mention how clear the glass is?




If you're interested in purchasing one of these lights, click here.