Olight SR90

Well I don't want it to be a sore spot, but I would like to understand this concept..... if you start in another place I would like to participate.

I understand laws of multiplication that says the hotter the more throw..... just now sure why laws of addition don't apply too that says, "More light equals more throw too".

Seems they both work together.

Sorry the discussion has hit a sore spot.. that wasn't the intention but rather to learn.
It's no sore spot.;) I just think that even though this conversation has bearing on the SR90 people would rather talk about things more directly relating to this light in this thread. There is also the issue that the majority ,it seems, of CPF does not understand this issue. If I take more time to explain it here how many will see it? It really needs its own thread. I hope I was not insulting in any way. I will advise everyone here when the thread is started. Until then might I suggest everyone stay off the topic unless someone wants to chime in who knows, really knows, what they are talking about. To do otherwise leaves a lot of misinformation out there that will just make the process to understanding all that harder.

This subject did not seem to be a problem at one time but this new SR90 in particular has gotten everyone confused as to the facts because it is a large die LED putting out massive numbers and beats the other LED reflector lights in the throw department. It is confusing for those who don't understand on a fundamental level.
 
I think its fair to summarize your explanation by saying that the hotspot in the Olight SR90 is much bigger.


thats the whole point.... they are different animals.. the SR90 doesn't have a
"hotspot"
... its the beam or the spill.... no corona, no hotspot.

The Beam is even throughout.... and quite big to evenly illuminate whatever it hits.
 
Well I don't want it to be a sore spot, but I would like to understand this concept..... if you start in another place I would like to participate.

I understand laws of multiplication that says the hotter the more throw..... just now sure why laws of addition don't apply too that says, "More light equals more throw too".

Seems they both work together.

Sorry the discussion has hit a sore spot.. that wasn't the intention but rather to learn.

I'll take a stab at it.

Take a dark room. Light a candle. You'll see light.

Light another candle. You've doubled your output, but it's not that much brighter. The positioning of that second candle is going to have a lot more impact on the room illumination than it's additional light output.

Now let's compare those two candles to fifty of them. Now you're going to start noticing the difference bigtime, regardless of positioning.

What we'd have here is a brute force approach with the candles - we've got a lot of light happening, and it shows.

Now blow them all out. Fire up an arc welder. It's going to light the place up more than the fifty candles. Why? Because it's simply WAY brighter of a source - a thousand candles can't match it in terms of brightness (but surely could be put to use to illuminate a lot more of a cave system).

So to go back to your question - adding "more light" just increases how much area you can light up, and adding "more intensity" just increases how bright you can go.

True, adding "more light" CAN increase intensity (obviously fifty candles is going to light a room up a lot more than one), but if you're going for brightness you want, well, brightness...

And all of this is about raw light sources - I am not even touching on the various focusing methods employed in flashlights.

Here's another description - take a person and have them yell across a valley. Now take fifty. They'll be louder, and they'll "throw" further, but a single trumpet would probably outthrow them in almost all directions. The trumpet is simply a louder source than most human voices, even if you're standing behind it.

I'm pulling figures out of my posterior here, but the basic point applies...
 
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Back to the OP.

I have one of the first SR90's and have compared it to several lights. I'll offer my subjective opinion (no scientific measurements) now:

This light throws like crazy!

This light has spill like crazy!

OK, that's probably not enough for most enthusiasts, so . . .

It completely embarrasses compact HID's (sub 35w).

It throws as good, if not better than the typical large reflector size 35w HID. (POB, etc.)

It has more spill and has a more useful beam than any of the above.

This light amazed me. I did not dare expect this kind of output from it. Even after I bought it and played with it in town, I wasn't convinced. But after taking it out to my little place in the country, I was convinced that is a viable alternative to HID in some uses. But, it's pretty darn big!
 
Back to the OP.

I have one of the first SR90's and have compared it to several lights. I'll offer my subjective opinion (no scientific measurements) now:

This light throws like crazy!

This light has spill like crazy!

OK, that's probably not enough for most enthusiasts, so . . .

It completely embarrasses compact HID's (sub 35w).

It throws as good, if not better than the typical large reflector size 35w HID. (POB, etc.)

It has more spill and has a more useful beam than any of the above.

This light amazed me. I did not dare expect this kind of output from it. Even after I bought it and played with it in town, I wasn't convinced. But after taking it out to my little place in the country, I was convinced that is a viable alternative to HID in some uses. But, it's pretty darn big!


I agree. I really do think that at the moment this light is unrivalled among led-lights for the combination of sheer raw power, throw and usefulness of its beam.

Its good to know that you have ranked it ahead of 35W HIDs. :thumbsup:

This says a lot about how far led-flashlights have come and I think that Olight deserve a tremendous amount of credit for being the first to produce a light in this league.

Its true the light is very large, but it has to be in order to adequately heatsink the heat emerging from a 30W led. The other reason that it has been designed like this is because a very large reflector is required in order to collimate the SST-90 this well.
 
Its true.... I can't find a smaller LED that rivals the SR90 in any way other than being smaller. Run times are limited or lumens are not as bright.
 
Its true the light is very large, but it has to be in order to adequately heatsink the heat emerging from a 30W led. The other reason that it has been designed like this is because a very large reflector is required in order to collimate the SST-90 this well.

I guess you forgot to mention that such a high outputs makes the demand of a large battery for satisfying runtimes, the reason to the large sized tube. :)

Regards, Patric
 
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I just took mine for a walk outside. When I turned into a long and unenlightened path I switched it on and the path was well lit up all the way to the end. Nice. Then I noticed that it was still in "low" mode. I pressed the button again and a second later all those little shadows and and speckles that inspire your imagination and make you see witches or giants, were simply erased. There was nothing but light. You could send a little girl over an old graveyard in an abandoned ghost town at midnight, as long as she has an Olight SR90 with her, she will be fine. I love this light and I wish I had an actual use for it.
 
It throws as good, if not better than the typical large reflector size 35w HID. (POB, etc.)
The first figures I saw for this light were in the 60Ks then I saw someone say 112,600lux and now your telling me it does over 570,000lux?:thinking: That's what my POB does anyway. Sorry but I'm not buying it.
 
The first figures I saw for this light were in the 60Ks then I saw someone say 112,600lux and now your telling me it does over 570,000lux?:thinking: That's what my POB does anyway. Sorry but I'm not buying it.

I'm assuming the 112,600 lux is likely to be around the correct reading unless someone with authority tells me otherwise.

jirik_cz explained that the 60,000 reading was inaccurate due to not being able to measure from so close up (1 meter) for such a large light.

Therefore he needed to obtain a reading from a larger distance and then to extrapolate back to 1 meter.

This seems to be the way lux readings are often calculated for larger lights.
 
A guy on our local forums has another Intimidator and he measured 104,300 lux (measured from 3 meters and converted). So at least two pieces have more than 100k lux :)
 
BEAMSHOTS???
Good or bad we neeeeed them!!! I'm still waiting on mine so for now I have to live through everyone else!!!!!!!
 
I've seen both already!!! I would like to see some basic beamshots out in the back yard or in a field. Maybe some comparison shots with other lights, they don't even have to compare in power!!!! SOMEBODY FEED ME:crackup:
 
I'm assuming the 112,600 lux is likely to be around the correct reading unless someone with authority tells me otherwise.

jirik_cz explained that the 60,000 reading was inaccurate due to not being able to measure from so close up (1 meter) for such a large light.

Therefore he needed to obtain a reading from a larger distance and then to extrapolate back to 1 meter.

This seems to be the way lux readings are often calculated for larger lights.
Trust me I get the need to measure from a distance. You do know what I do every day don't you? My problem is Dead_Nuts thinks that the SR90 can beat a POB. There is no way in this world unless he is comparing it to a defective one.
 
Trust me I get the need to measure from a distance. You do know what I do every day don't you?

Of course, I know that you are an expert when it comes to these things. :)
Then we agree that the SR90 is probably around the 100,000 - 115,000 lux at 1 meter ball-park.
This to me is wonderful for an led with such a big die that puts out so many lumens.


My problem is Dead_Nuts thinks that the SR90 can beat a POB. There is no way in this world unless he is comparing it to a defective one.

Well, to tell you the truth, I have to confess that I don't even know what a POB is, having never really explored HIDs properly. :sssh:
However if said POB has a 570,000 lux per meter reading, then clearly its in a different league to the SR90 for throw.
Perhaps Dead_Nuts is talking about a different version from the one you are thinking about or perhaps it has a varying focus and its not been set to the tightest setting?
 
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