64440 help

[EvilPaul2112]

I recently began assembling a 4 AW "C" mag with an AW soft start driver. Problem is I cant get the 64440 lamp to focus very well in my FM reflector . It produces alot of heat and un-focused light, but my 3 AW "C" mag85 is brighter. Using Lux's bulb test data this thing should throw tons of light. Any ideas?

Thanks in advance,
PAUL

 

[StefanFS]

I recently began assembling a 4 AW "C" mag with an AW soft start driver. Problem is I cant get the 64440 lamp to focus very well in my FM reflector . It produces alot of heat and un-focused light, but my 3 AW "C" mag85 is brighter. Using Lux's bulb test data this thing should throw tons of light. Any ideas?

Thanks in advance,
PAUL

I have two 4D 'budget' builds with KIU sockets, one with smooth and one with op alu reflector, FM battery holders with eneloops. These lights are 'wall of light' type of builds. With the stock low resistance fixed switch they are ok with up to 65-90W bulbs. They do throw well, but it's a wall of light!

The pics below are 64440 IRC with smooth reflector and 12 eneloop cells. It's hysterical.

From this thread:
http://www.candlepowerforums.com/vb/showthread.php?t=192740

Stefan

 

[LuxLuthor]

I agree with StefanFS, when this bulb is properly driven, it should be blowing you away....so you are coming up short mainly because you don't have enough muscle with those cells...and have too much resistance as an additional factor.

While that bulb draws less than the AW PCB cutoff of 5.5A, you are not getting the voltage you think you have. At 5.0 to 5.4 Amps, the AW Li-Ion is going to be performing between the 4.5 & 6 Amp bottom two lines on this graph (below) from AW....or roughly a range of 3.2 to 3.5V/cell x 4 = 12.8V to 14V.

Your perception vis-a-vis Mag85 is correct when you look at where you are on the scale...and remember with your Maglite resistance (assuming 250 milliohms), you are dropping another 1.3 Volts (5.3 Amps x 0.25 Ohms) ...so your actual voltage delivered to the bulb with this setup is more like 11.5V to 12.7V !!! Now go look at my chart to see the output of this bulb at that voltage range.

"Scotty, we need more power!"

 

[EvilPaul2112]

Thanks much to StefanFS and Lux. As usual Lux I am in your debt for valuable info that saved me alot of time and energy. Im back to the drawing board seeking a new lamp to install in my 4 AW "C" project.

Thanks much gentlemen !

Regards,
PAUL