P7 reflectors?

[sortafast]

What options are out there for optics/reflectors for the P7? I have seen the one on DX, but I am looking for something a bit smaller in dia.

 

[PsycoBob[Q2]]

I've got several P7's otw, and I'm looking for small optics too. P7's have a die even bigger than a Lux-V, and a HUGE housing. That housing killed the idea of reusing some of my spare optics, and the die will severely limit the throw with smaller reflectors.

If anyone finds an optic (reflector, lens, combo) that will give throw similar to Fenix lights that doesn't need a Maglite-size head- please, share!

 

[jirik_cz]

ledil is preparing one http://ledil.fi/datasheets/DataSheet_Boom_p7.pdf

 

[Jamesdh266]

When will that be out and where can we buy it?

 

[PhotonFanatic]

Khatod is also coming out with a reflector for the P7; I am waiting for a sample. I've also got the Ledil reflector on order, but they haven't made them yet.

 

[Nitroz]

Khatod is also coming out with a reflector for the P7; I am waiting for a sample. I've also got the Ledil reflector on order, but they haven't made them yet.

Will you have these for sale?

 

[Jamesdh266]

when are you expecting to have stock of either in?

 

[sector_cleared]

Any news here? I got the host already and the LEDs are on the way...only thing missing is a proper reflector :mecry:

I need those LEDILs

 

[PhotonFanatic]

I received the Khatod reflector samples--one is 23mm in diameter, the other is 28mm in diameter. I will try to test them out tomorrow and get some beam shots posted. Delivery is still 2-3 weeks out though.

 

[PhotonFanatic]

Just a quick update on the new Khatod P7 reflectors.

I wired up a P7 on a massive brass heatsink and installed the 28mm diameter reflectorn (smooth surface), which, btw, is just a slip on fit over the black plastic ring, and fired it up. At low amperage, one can just barely see the faint outline of the dies, but by 750mA, they are merged beyond recognition, of course. My wall was about 2' from the LED. Cranking it up to 2.8A and one gets a nice distinct hotspot, fairly large, with still a good amount of sidespill.

The 23mm reflector was, as one would expect, a lot more floody, so much so that I really don't see why one couldn't just use the LED alone rather than using the 23mm reflector. There was a hotspot, fairly diffuse and there was a lot more sidespill than from the 28mm reflector.

I will be off to buy some white poster board in the next couple of days and will attempt to post beam shots thereafter.

In the meantime, I like this reflector, i.e., the 28mm, enough that I will be placing an order for them tomorrow. I will also try to order the stippled version at the same time.

 

[sector_cleared]

Thanks for the info PF.

It's a pity that the 23mm reflector is doing such a bad job. My intention is to squeeze 3 P7's in a Mag D head. But 23mm would be to big anyways i guess.

Do you have news regarding the LEDIL Boom-S for the P7?

 

[PhotonFanatic]

It's not that the 23mm reflector is poorly made, it is just the parameters of the light output and the size of the reflector that yields the floody pattern.

Re the Ledil's--I will check once again with the supplier, although they promised to let me know when they could get them from Ledil.

 

[CM]

...My intention is to squeeze 3 P7's in a Mag D head.

I think you're getting carried away. One P7 in a Mag D head gets hot pretty fast. A single P7 is about 10W of heat. Three at 30W plus power supply heat in a Mag D just won't cut it unless you plan on using the light for short bursts. It's just not a practical platform.

It's also a challenge to find an *efficient* driver to drive one of them, let alone three. You can get the cheap DX or KD crap but most of them will shut down on you due to inefficiency and heat generated. One P7 is plenty. I built one using a D bin from Photonfanatic and it was measurably brighter than a 10W Welch Allyn Solarc HID.

 

[PhotonFanatic]

Cris,

Great point--I tend to overlook the obvious. :laughing:

Perhaps because I never make any mulit-LED lights.

What did you use to drive the P7?

I'm thinking of using the D2DIM with a resistor to limit the current--when I eventually do get around to making a P7 light. :naughty:

 

[CM]

Cris,

Great point--I tend to overlook the obvious. :laughing:

Perhaps because I never make any mulit-LED lights.

What did you use to drive the P7?

I'm thinking of using the D2DIM with a resistor to limit the current--when I eventually do get around to making a P7 light. :naughty:

A TI PTH08T230. It's constant voltage so you need to tweak the sense resistor for the particular LED. With an input of 7.2V, measured efficiency was about 95%

 

[sector_cleared]

I think you're getting carried away. One P7 in a Mag D head gets hot pretty fast. A single P7 is about 10W of heat. Three at 30W plus power supply heat in a Mag D just won't cut it unless you plan on using the light for short bursts. It's just not a practical platform.

It's also a challenge to find an *efficient* driver to drive one of them, let alone three. You can get the cheap DX or KD crap but most of them will shut down on you due to inefficiency and heat generated. One P7 is plenty. I built one using a D bin from Photonfanatic and it was measurably brighter than a 10W Welch Allyn Solarc HID.

Carried away? Dunno what u r talkin about :santa:
Of course this won't be a light to use for extended periods on the highest setting. I will turn a heatsink with a big mass so I have a big thermal capacity. This should be good for at least 5 mins runtime on maximum.

As driver I will use my selfmade synchronous step down converter with continously variable output current. BTW there is no difference in heat dissipation for the driver if you drive 1 or 3 P7s (assuming that u connect them in serial).

But without the reflectors this won't be possible :mecry:

 

[CM]

...BTW there is no difference in heat dissipation for the driver if you drive 1 or 3 P7s (assuming that u connect them in serial)...

Actually there is. If the efficiency is fixed but your load triples in power, the amount of power the driver dissipates will also triple.. Of course you might see some improvement in efficiency but it's not enough to offset the 300% load increase.

 

[sector_cleared]

But the efficiency is not fixed. What is fixed is the voltage drop of your driver at a certain amperage. You have the MOSFET-, Inductor-, path-resistance, sense resistor and other losses (ESR, inductor losses). If you add up all the resistance in the path of the current and multiply it with the current, than you'll get the voltage drop.

For example:

Total resistance: ~100mOhm

Current: 3Amps

Voltage drop: V=R*I=0,1Ohm*3A=0,3V

Power dissipated: P=V*I=0,3V*3A=0,9W

Lets say you drive a Load with 10W you get a efficiency of:

Eff= PLOAD / PIN = 10W / (10W+0,9W) = 91,7%

What is important in this calculation is the fact that the driver's voltage drop is dependend on the ampereage, not on the voltage. Therefore its power dissipation won't change even if you connect 100 P7's (which is not possible due to voltage strength of the capacitor and the MOSFETs).

Ok, enough offtopic... I need those LEDILs

 

[Al Combs]

My intention is to squeeze 3 P7's in a Mag D head. But 23mm would be to big anyways i guess.

I ran across this thread while looking for something else. The larger circle that contains three smaller ones is 2.1547 times the diameter of the smaller. If the Khatod's are really 23 mm, that's a 49.56 mm housing to contain them. My Mag's reflector housing has a 50 mm I.D. for the first 2¼ mm depth at the very front. Further back, the bulk of housing is ≈ 48.1 mm in diameter.

Depending on the shape of the reflector, it might fit without modification if the housing is turned to bring the reflectors up against the cover glass. At worst, it would only take a little bit of filing to make them fit.:thumbsup:

 

[steve6690]

I ran across this thread while looking for something else. The larger circle that contains three smaller ones is 2.1547 times the diameter of the smaller. If the Khatod's are really 23 mm, that's a 49.56 mm housing to contain them. My Mag's reflector housing has a 50 mm I.D. for the first 2¼ mm depth at the very front. Further back, the bulk of housing is ≈ 48.1 mm in diameter.

Depending on the shape of the reflector, it might fit without modification if the housing is turned to bring the reflectors up against the cover glass. At worst, it would only take a little bit of filing to make them fit.:thumbsup:

cheers for that. I couldn't find a formula for this so I ended up working out my own way of figuring out how many reflectors (for example) would fit inside a housing. It's probably wrong of course but this was it...

if A is the ID of your housing
and B is the diameter of your reflector

(A - B) x 3.1416
take the answer and divide it by B

In my case I had a housing with an ID of 52mm and I had 6 x 18.5 mm diameter reflectors to try and squeeze in.

52 - 18.5 = 33.5
x 3.1416 = 105.2436

divide by 18.5 = 5.688 reflectors that would fit, so it was a no go. I ordered the reflectors anyway and they truly did not fit. Using this "formula" I calculated that I'd need to have reflectors of no more than about 17.8mm diameter to get 6 in the housing. Out came the file....they're all at around 17.6mm dia now and it nice and snugly. The formula makes sense to me but I was never very good at mathematics...