Old 07-22-2010, 08:05 PM #1
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Default Noob question about calculating output power?

I know it sounds dumb but I think im missing something. If P=IV then a 3.5V battery running 600mA would put out 1785mW assuming 85% driver efficiency. But this is not the case right? So is there a diode inefficiency as well or am i missing something?


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Old 07-22-2010, 08:25 PM #2
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Default Re: Noob question about calculating output power?

Of course there's diode inefficiency, and that varies by diode. Those diodes get VERY hot, so a lot of that energy is being lost in heat. Which diode are you talking about? 445? 405 (PHR,6x,8x,12x?) 655?
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3392nm:REO LHIP HeNe 2mW ∙ 980nm:OLIKE 155mW

808nm:OLIKE 200mW ∙ JETL PLC 600mW(682pk)
780nm:OLIKE 120mW
685nm:18650 47mW
671nm:PGL3M 281mW DPSS ∙ PGL3C 278mW
655nm:LOC 254mW ∙ OLIKE 221mW ∙ Yob 320mW
638nm:Sanyo 40mW ∙ HL63133 200mW ∙ PGL3C 463mWpk ∙ ML520 700mW
633nm:JDS1145 HeNe 28mW ∙ JDS1145 HeNe 26mW
612nm:MG 05LOR151 HeNe 3mW ∙ REO LSTP 3mW
609nm:REO LHOR 1mW
604nm:REO LSTP 2mW
594nm:Rigel 3mW ∙ LG PGL3C 15mWpk ∙ Lasos 7512 3mW ∙ CNI MGL3 58mWpk
589nm:CNI PGL3C 106mW ∙ CNI PGL3C 85mW
561nm:CNI PGL3C 30mW(41pk)
556nm:CNI PGL3C 20mW(22pk)
544nm:JDS1675P HeNe 2mW ∙ REO LHGR 2mW ∙ Lasos 7786 2mW
532nm:PGL3C 150mW(180pk) ∙ PGL3C 578mWpk ∙ PLC 440mWpk
515nm:JDS 221420GL ArI 30mW
510nm:52mW DG#2 ∙ 50mW 26650 DG
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476/480nm:Nichia Diode 28mW
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458nm:JDS 2214VL ArI 8mW ∙ JDS 2214VL ArI 12mW ∙ RHD Diode 1.7W
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Old 07-22-2010, 08:36 PM #3
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Default Re: Noob question about calculating output power?

Im going to be making a 405nm but I recall seeing this difference in a lot of builds for example this thread
http://laserpointerforums.com/f65/po...-mw-51432.html
I assume a lot of these are using the 3.7V 18650 which would give a diode efficiency of about 30% i think?

assuming all but the driver and diode are 100% efficient I know big stretch

Last edited by vivioo7; 07-22-2010 at 08:42 PM.
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