KDs KDU773 Bulb anyone use one?

[rizky_p]

I have several KD 773 bulb to play with. not a good bulb IMO.

After playing with 6 cells i found it too yellow and dim, then i soldered 6 cells together(i was using a 3AA->2D) and add 7th cells to the pack its white and bright all right but the bulb flashed definately need soft start while using 7 cells.

I think with 6 cells Osram 64250 is alot better option, not only whiter and brighter i can get Osram 623 locally and cheaper as well . I am using Osram 64250 instead. I wish 250 can be use with 7 cells must be really bright.

Thanks to Lux for his light bulb destrutive test.

Setup:
Using KD PR to Bi-pin adapter
Did the Mag resistance mod(Tail, switch, tower, etc)

Thanks.

 

[lctorana]

That's disappointing.

The website quotes current and lumens at 8.3V, so wouldn't you think you could expect 7 cells to work OK?

As the 64250 flashed @ 8.1V in LL's test, I'm thinking the 3853H is likely to be the 7.2V hotwire of choice.

Or the WA 1164.

 

[rizky_p]

That's disappointing.

The website quotes current and lumens at 8.3V, so wouldn't you think you could expect 7 cells to work OK?

As the 64250 flashed @ 8.1V in LL's test, I'm thinking the 3853H is likely to be the 7.2V hotwire of choice.

Or the WA 1164.

I dont know why 7 cells flashed the bulb the resistances should handles them. A freshly charge 7 cells pack measured 9.3v WILL flashed the bulbs even with stock resistances. I tried a slightly drained 7 cells pack works with KD773U but a freshly charged is a No-No.

I prefer the Osrams since i can get them locally.

Thanks.

 

[Fusion_m8]

oh no... this is making me real uneasy as I've just ordered a set of 5 KDU773 bulbs from KD....

What I REALLY need to know is will my 2D mag with a KDU773 running on fresh 6x Nimh AAs brighter than a 6D mag with Magnum Star bulb???

If its not...I'm gonna be

 

[lctorana]

Yes, a lot brighter.

Since you are local, I can also tell you to get a HPR71 at Bunnings (sold as the replacement globe for the Dolphin Rechageable) for an instant wow. My favourite hotwire globe by far.

 

[Fusion_m8]

23/04/08:

Just got the HPR71 from Bunnings, it bl@@dy expensive! $11.98 for one bulb!
But its signifcantly brighter than the KDU773. I'd estimate the HPR71 puts out about 250-300 torch lumens. Not "wow" stuff, but good enuff!

Yes, a lot brighter.

Since you are local, I can also tell you to get a HPR71 at Bunnings (sold as the replacement globe for the Dolphin Rechageable) for an instant wow. My favourite hotwire globe by far.

 

[FILIPPO]

oh no... this is making me real uneasy as I've just ordered a set of 5 KDU773 bulbs from KD....

What I REALLY need to know is will my 2D mag with a KDU773 running on fresh 6x Nimh AAs brighter than a 6D mag with Magnum Star bulb???

If its not...I'm gonna be

from what spec. say I think that 773 is made to run with 6 nimh "hot of the charger" but you cannot know if sepc. are correct...it isn't rare to have spec. @ 600L and get only 200L from that bulb...

so the best thing you can do is to try it...(tell us how does it work) and if you are happy use it, if not you can order some wa1111 from litho 123 and use them with the same set up.

 

[Ogg Vorbis]

I've been running them just fine on 7AA NiMH hot off the charger using a 8AA to 2D mad-a-mag holder and a dummy cell. I tried 8AA but that's way too much. Oh and i've done all the resistance fixes too...

It's pretty bright but nothing like an ROP

Dan

 

[Fusion_m8]

Just got my package from KD this morning.

Those KDU773 bulbs are pretty cr@p:thumbsdow in my opinion, they claim 773 bulb lumens, which should equate to about 400 torch lumens. But in reality the output is AT MOST 200 torch lumens. The beam profile is shockingly artifact riddled and uneven, even when using a MOP reflector.

I'm disappointed:ironic: with the KDU773, but I guess I can get a Philips HPR71 and see how that stacks up.

from what spec. say I think that 773 is made to run with 6 nimh "hot of the charger" but you cannot know if sepc. are correct...it isn't rare to have spec. @ 600L and get only 200L from that bulb...

so the best thing you can do is to try it...(tell us how does it work) and if you are happy use it, if not you can order some wa1111 from litho 123 and use them with the same set up.

 

[FILIPPO]

Just got my package from KD this morning.

Those KDU773 bulbs are pretty cr@p:thumbsdow in my opinion, they claim 773 bulb lumens, which should equate to about 400 torch lumens. But in reality the output is AT MOST 200 torch lumens. The beam profile is shockingly artifact riddled and uneven, even when using a MOP reflector.

I'm disappointed:ironic: with the KDU773, but I guess I can get a Philips HPR71 and see how that stacks up.

I'm sorry to know that...I hope you are not angry with me for my suggestion...

now there is my 2nd suggestion...

 

[Fusion_m8]

hahaha... no not angry, as long as you're a big fan of Ferrari F1!!!:thumbsup:

I'm sorry to know that...I hope you are not angry with me for my suggestion...

now there is my 2nd suggestion...

 

[Toohotruk]

That sucks! I just ordered a 5 pack of 773s! Oh well, at least I can use other bi-pin bulbs with the adapter.

 

[FILIPPO]

I think we can suppose KD880 has really low performance like KD773...:ironic:

 

[Fulgeo]

Hey guyz I wanted to chime in. I have made a few mods using the KD733U lamps. My first mod I used a 2D Mag utilizing FM 6AA to 2D battery holder and Sanyo 2700. I am guessing about 400 lumens out the front. Runtime is about 60+ minutes. The beam does have artifacts but I got great results doing the following. I used a MOD reflector and I put an aspherical lens http://www.surplusshed.com/pages/item/pl1106.html in place of the boro lens I usually use. This really cleaned up the artifacts and made the beam very spotty. My 2nd mod I used two Emoli to drive the KD733U lamp. Once again I used the aspherical lens. This worked very well. Would guess 600-700 lumens out the front. Runtime about 60 minutes. This setup is on par with my WA1111 mods. The aspherical lens trick works great for large fat filament bulbs like KD733U, Phillips 5761 and Osrams. It does not work well with small filament bulbs like the WA1111.

In summary I would say the KD733U does have a home if you drive it with 2 Emoli. Hot off the charger at 8.1-8.2volts the KD733U does not flash with the Emoli. I also have mailed 2 KD733U bulbs to LuxLuthor. His fine thread http://www.candlepowerforums.com/vb/showthread.php?t=179748
Destructive Incan Bulb test. When he gets a chance he will test them and we can really see what is going on with this bulb. Here are a few other links that might be helpful.

http://www.candlepowerforums.com/vb/showthread.php?t=179681

http://www.cpfmarketplace.com/mp/showthread.php?t=172541

http://www.kaidomain.com/WEBUI/ProductDetail.aspx?TranID=3989


Happy Modding!

 

[Toohotruk]

I should have checked here first, rather than taking the word of the two "reviewers" on KD's site before I bought a five pack!

Oh well, maybe they will be at least somewhat adequate. :shrug:

I'll have to order an aspherical lens for my ROP and see how I like it...thanks for the links.

 

[Linger]

Anyone have recent news with this cell?
I've used it to spare my ROP bulbs while I wait for my first shipment from Litho.

Roughly ~20 minutes combined in-the-field use the other night walking in the forest spotting trails, when I got back home the next day, each of the 7 eneloop cells had ~1.3v remaining. I'm satisfied.

 

[Fulgeo]

Anyone have recent news with this cell?
I've used it to spare my ROP bulbs while I wait for my first shipment from Litho.

Roughly ~20 minutes in the field use spotting trails, 7 eneloops cells each had 1.3v when I got back home the nextday. I'm satisfied.

I have approximately 20 hours on my build that uses the KDU733 bulb that has been driven for the most part with 6 Eneloops in a FM battery holder. The bulb's glass envelope is starting to get a slight dark tint to it but it is still going strong. I built one of these lights for my older brother must be about 1.5 years ago. I used Sanyo 2700 in his build and he is still on his first bulb. 7 Eneloops are probably a bit hot for the KDU733 bulb depending on how much resistance you have in your build. I still like this bulb for a decent long running 400+ lumen flashlight.

 

[Linger]

I am not sure how much resistance there is, but from Lux's graphs I'm certian 7AA is with-in limits (even before resistance). What makes you think it is 'too hot?'

I really like it. I'd been using eneloops as I have many of them. A few weeks ago I noticed a marketplace offer for duracell 2650's and they were well rated in a nihm shoot-out so I picked them up.
Putting them in today, (using the same KDU773 bulb) slightly lower pack total voltage (as 2650 cells rested over-night) the output was noticeably more intense. It was a whiter more solid beam.
As my first high-powered incan, I am very happy with it.

-Linger

 

[rizky_p]

wow i am surprised people are still replying to my old thread...didn't realized that many actually ordered KD 773 bulb. I haven't been playing with incan lately, but i still have some spare of KD773 bulbs. I think I'll play with it again when i get the time but with recent advancement in LED tech it is hard for me to go back to incan.

 

[Linger]

didn't realized that many actually ordered KD 773 bulb.

I received them with my Mag, and I'm glad I did.
How did you use them? any comments if they'll survive 8AA?
Sure, led's are interesting. I've been pondering how I'll focus the ssr-90 sitting on my table. But this is also what's struck me about incans. LED's focus are a mirror image - the hybrid OP / smooth reflector in my iTP c9 creates the hot-spot in the final / upper / smooth portion of the reflector. Incans shoot a beam of light straight forward from the bulb. The reflector redirects the spill more forward, but the hotspot is pure bulb. Led's are pure flood au natural, and reflectors / lenses / optics shape the beam into a hot-spot.

I wish I had the proper skill to exploit these differences. As it is I can only use the various components at hand. (Going 26mm Frean i think for the -90)

best,
Linger