Choosing the right head-torch
How bright is a 15000 lumen headtorch?
It's just so confusing and why are there claims of super-powered brightness. The above example is just a marketing stunt. To have a head-torch capable of emitting 15000 lumens you would first need a Low pressure sodium vapor lamp 100-200 lm/W and then a very big battery to power it! If we're talking LED head torches you'll need about 170 Watts of top end LED power to gain 15000 lumens, that equates to about a 12V / 25amp battery which will give you around 2 hours of light! Now although this is achievable with today's technology, the current marketed products cannot possibly supply this amount of light from a single cell power source. You would need a large miners type lamp with external battery pack carried either in a backpack or around your waist. In my view this is no longer a head-torch as a head-torch should be carried solely on the head.
To summarize - The battery technology is just not advanced enough yet to enable super powered devices with nano power sources. In my opinion it's much better to go with the already proven tech of today by choosing a head-torch which is powered either by AAA batteries or rechargeable via USB. When selecting your new head-torch be realistic with your expectations, if it seems too bright to be true it probably is. Choose portability and durability over brightness, something that is waterproof, shockproof and long lasting on a single charge.
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The following conversion charts and information are brought to you courtesy of - http://www.rapidtables.com/calc/light/watt-to-lumen-calculator.htm
How to convert watts to lumens
How to convert electric power in watts (W) to luminous flux in lumens (lm).
You can calculate lumens from watts and luminous efficacy.
Watt and lumen units represent different quantities, so you can't convert watts to lumens.
Watts to lumens calculation formula
The luminous flux ΦV in lumens (lm) is equal to the power P in watts (W), times the luminous efficacy η in lumens per watt (lm/W):
ΦV(lm) = P(W) × η(lm/W)
lumens = watts × (lumens per watt)
lm = W × (lm/W)
What is the luminous flux of a lamp that has power consumption of 60 watts and luminous efficacy of 15 lumens per watt?
ΦV = 60 W × 15 lm/W = 900 lm
Information courtesy of - http://www.rapidtables.com/calc/light/watt-to-lumen-calculator.htm