Bro, when at distances other than 1m, its better to use candlepower, cuts down the confusion esp with some newbies doing calculations as the distance is already "converted". I think that's what you are caculating but the unit shd really be CP.
Candlepower = lux times (distance ^2) Eg CP = 10,000 lux times 5 metres squared = 250,000 CP.
With throwers (small arc/emitter + big reflectors), it makes sense to measure at father distances. XM-L of 40-55mm reflector, should be ok.
My big reflectored HIDs need at least 10m. :) Some short arcs need 20-30m at least.
And yes, that was the computation I did for conversion to 1m.
What do you guys think of the actual figures I got? They seem pretty high to me, although my HS-802 (R2 overdriven at 1.4A battery draw from stock) throws to 500m, barely visible that is, and under the best conditions.
Sounds within the bounds of sanity to me - I get 36700 from a Raidfire Spear clone with a Q5 not driven terribly hard so a fully driven R2 in a good deep reflector ought to do better.
AFAIK just about no LED has hit the 100,000 lux at 1 metre point though Lambda did make an XM-L that came very close - it was heavily overdriven and was directly mounted to a half a kilo or so of copper.
I'll take more measurements from farther still, so as to use the luxmeter range with the highest accuracy, which is the 200-2000 lux range (x1) for my new toy.
Also to keep in mind is the fact that I'm using the luxmeter with the Max mode engaged and I move the beam slightly, so the readouts always reflect the brightest value within a possibly not quite even hotspot.
That's pretty nice. It takes 4-5m to stabilize the reading, which is to be expected w/ throwers. I don't think optimizing for meter sensitivity is going to do much since this is stuff is +/- 5% easily.
At 1 metre this is almost essential - the readings can double depending on where you are in the hotspot. My throw measurements are always the highest number I can get to be stable on the meter.
This light was mentioned in the original post, But not talked about. I ordered it a few days ago from Manafont but it hasn't shipped yet. I hope it proves to be a pocket rocket and work as good as it looks.
SKU: 7732 Sky Ray G6 Cree R5 5-Mode Stainless Steel LED Flashlight (1*18650) $21.20