only 50,000 lux from my mag :(

i read only 50,000 lux from my modded mag (mag 4D, 3" smooth reflector, 16 ni-cd AA, 12V 50W osram horizontal filament)

with a axial you think i can improve?

i read 50,000 at 1 meter but you think is best to read more far?

your meter might have a limit at 50K lux. Double the distance you test at and quadruple the lux reading(inverse square law).

I wouldn't expect higher values from a 3" reflector...

Well my Thor-X 10mcp spotlight only manages 120,000 from a huge reflector and 100W bulb, so 50,000 is absolutely nothing to sneeze at. Unless you have allergies.

My Mc85 showes 62Klux at one meter with 9aa (59K w/8aa). UltraStinger w NIMH stick is 24klux for reference (SF U2 is 2400lux).

Take note that this is an extech DVM adapter rated at 50klux but the voltage continues to rise in a predicable manner. I need to put a ND filter on it to use as a scalar and see if the meter output over spec is linear and correlates well with the filtered data


Also, just a few inchs closer or further and the data changes quite a bit so don't compared directly with someelses data. Test another light and compare the differences.

tonight i try the new bulbs that i have buy... 50 and 20W axial... also i hope that the batteries will drop less voltage after more cicle of charge-discharge... measure at 1 and 2 meters...

i let you know

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chevrofreak said:
Well my Thor-X 10mcp spotlight only manages 120,000 from a huge reflector and 100W bulb, so 50,000 is absolutely nothing to sneeze at. Unless you have allergies.

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Since in stock configuration, the Thor doesn't drive the bulb near 100W, it would be dim... Incandescents get really inefficient when underpowered.

reading done:

20W osram 4000hr life axial filament

spot 47k lux at 1 meter 12k lux at 2 meters
spill 1300 to 2300 lux at 1 meter


50W osram 4000hr life axial filament

spot 67k lux at 1 meter 16k lux at 2 meters
spill 2000 to 5000 lux at 1 meter

good or bad? /ubbthreads/images/graemlins/confused.gif

Sounds good. The (1/distance)^2 law is valid and you have almost the same lux readings (for the focus) for 20W and 50W, since the filament brightness is similar.
And the spill scales directly with the wattage.
=> Everything is as expected

I'm doing something similar with a 50W 12V halogen in a 50mm dichromic reflector. I am, however, exploding a lot of CR123s getting there.

this mean that i can't obtain more that 60-70k lux from any halogen bulb? /ubbthreads/images/graemlins/icon23.gif

You can increase the lux reading significantly only with a larger reflector (or stronger overdrive and reduced lamp lifetime).
With HID you can roughly double your lux reading.

"60-70k lux from any halogen bulb"

Increase the reflector, decrease the filament width or anything else you can do to increase the ability to focus to a smaller spot.

Of course the targeting of the visible wavelengths like HID is a plus. Halogen produces so much IR that is just wasted

i done a test for the voltage drop...

16 ni-cd AA unloaded 20,8V

under 2,1 amp 18,5V

under 4,9 amp 16,4V

they are bad isn't it?