Review of Brinyte Dive lights
Weight : 345grams 26500 Li Ion 3000mah
385 grams 3 x AA NiMh Sanyo 2700mah
280 grams empty
Diameter head :50mm
Description: Due to its short side this could be a good candidate for keeping in shallow pockets,
Its ability to take either 3 x AA NiMh/NiCd or Alkaline cells or a 26500 Li Ion cell makes it quite versatile for powering although the 26500 Li Ion cells are not all that common place.
At up to 385 grams it is defiantly a heavy weight.
It has the largest reflector of all the reviewed DIVxx lights and as a result has the tightest beam.
Run time and lumen out put will vary depending on what batteries you use. I would expect about 50-60 minutes using the 26500 at a fairly constant output of about 800 lumen. If you use NiMh2700mah then the run time would be about the same. Less with 2200mah cells.
AA Alkalines would probably give a longer run time, but of course cost more to use.
Weight : 270grams 18500 Li Ion
220 grams empty
Diameter head :42mm
Description: Its thin body lacking the protruding switch of the DIV08 makes this a great light to clip off and bungee to your shoulder straps of harness or BCD.
Run time is 50-60 minutes with a 2400mah Li IOn 18650 cell and up to 80 minutes with a high quality Panasonic 3400mah 18650. Output is about 800 lumen but will drop as the batteries drain down.
I have modified one of these to run half power. The result is twice the run time.
Weight : 340grams 18500 Li Ion
290 grams empty
Diameter head :45mm
Modes:High.medium,low, hidden strobe.
Description: These have 4 different power levels that are cycled with a push of the magnetic button. High, Medium, Low and Off. You can also access the strobe function at any time by holding the button for 2 seconds.
Run time on high is 50-60 minutes with a 2400mah Li IOn 18650 cell and up to 80 minutes with a high quality Panasonic 3400mah 18650. Output is about 800 lumen but will drop as the batteries drain down. Low mode will probably give 3-4 hours ( Not tested yet).
Weight : 850 grams with 26650 Li Ion batteries
290 grams empty
Head Length ( not inc gland): 160mm
Head Diameter :45mm
Canister Length ( not inc gland): 260mm
Canister Diameter: 35mm
Modes:Very High (11.4watt*) High (9.7watt*).medium (8.5watt*),low (5.6watt*), hidden strobe
Switch: Push Button (on canister)
Description: These have 5 different power levels that are cycled with a push of the magnetic button. Very high, High, Medium, Low and Off. You can also access the strobe function at any time by holding the button for 2 seconds. It shares the same reflector as the DIV03,
Run time on high is calculates at 5 hours with its 3 x 5000mah Li Ion 26650 cells, and up to 24 hours on low. Output is rated at 1000,600,400,200 lumen depending on mode. These brightness levels should remain pretty constant regardless of battery voltage until flat. If using protected Li Ion's then the light will shut off with no warning. Use of non protected Li Ions may result in damage to the batteries if driven flat.
Use of 4 C cells may also work in a pinch but I wouldn't recommend them for everyday use.
By understanding some of the specification we get a better idea of how a light may perform in real world use. We can then easily see how some published specifications can simply not be true.
First off lets consider the lumen. Lumen is a measurement of total produced light. The more power you put into a LED the more lumen it produces. Pretty simple really.
One of the most common LED's in use for dive lights is the Cree XML or the new and improved XML2. These produce about 1000-1100 lumen when driven at about 10watt ( maximum recommended by Cree). While it is possible to get more lumen, you would need to put more power into the LED and this will reduce the life of the LED. In some cases down to a couple of seconds!! For lights that claim in excess off 1100 lumen, there are two options. First, The XML LED is over driven or the second and most likely is its simply lies.
Run times can be calculated by understanding battery capacity and LED power consumption.
But you also need to consider how many lumen are produced at the different stages of battery life.
For most single battery lights with a single LED, it will produce the most lumen on a fresh battery and slowly decrease as the battery voltage decreases. Multiple battery lights tend to run the LED at a constant power for the complete run time of the light then suddenly switching off with out warning.
To calculate battery capacity.... Watt hours =Amp hours X nominal voltage
Amp hours are the capacity of the cell. Most 18650 Li Ions are about 2.4ah (2400mah). Nominal voltage for a Li Ion is 3.7volts ( max is 4.2 min is 3.0) So 2.4 amps X 3.7 v = 8.88 watt hours. This simple means it can deliver 8.88 watts for one hour. Or 0.888 watts for 10 hours.
Some 18650's have capacities as high as 3400mah ( 3.4x 3.7=12.5watthours).
Watts = Current (measured in amps) X Voltage. The Cree XML has a recommended maximum current consumption of 3 amps and a working voltage of about 3.3 volts. This means it consumes about 10 watts to produce its 1000-1100 lumen.
So a single 2400mah (8.8wh) Li Ion cell will power a 10watt LED for about 50 minutes.
A battery pack like the DIV09 is 3 x 5000mah x 3.7 = 55.5 watt hours. So the same LED would be driven for about 5.5 hours.