Originally Posted by
dnar
Yeah mate. I am already cubing. I am busting my balls to obtain more red power in a smaller beam...... The 640 price is really not sitting well with me.
all this price/performance ratio got me calculating and this is what i found
if we generally accept that 4 640s are equivalent to roughly 12 660s, then the price difference is not that great. yes the diodes themselves are worlds apart in terms of price, but for a 12banger 660 you will need 12 diode mounts, 12 lenses and barrels and 13-14 flex mirror mounts to get the job done, while in a 640 situation all you need is 4 diode mounts and 3 flex mounts (two for mirrors and one for pbs)
put the math together, maybe it is not as bad. maybe the 640 is even cheaper. maybe i have my calculations wrong, but i was expecting loads more. of course the above stands if you use ready made mounts and if you don't have a mill. if you make the parts yourself, 660 is the way to go
12_660_____________4_640
12*5=60___diodes___4*100=400
12*20=240_mounts__4*20=80
14*15=210_flex_____3*15=45
12*5=60___barrels__4*5=20
12*5=60___lenses___4*17=68
total 12_660=630___total 4_640=613
i was thinking about something else then. for the best beam specs in a quad, you'd better use short fl lenses and stack two side by side and then pbs another two on them. this will give you a beam of 6x6mm. then you can telescope using a ratio 2:1 and still have a divergence less than your blue one
just some thoughts...
Last edited by LaNeK779; 04-12-2011 at 15:32.
Reason: calculations "table"
"its called character briggs..."