Halcyon Focus 2.0
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To how narrow? And how wide?
I guess I don't, either. I already know one number that means I won't be getting one of those anyway.
seeker242
Contributor
sea_otter
Contributor
I don't have an HID to compare, but here's a comparison with a BigBlue TL3100p (10 degree spot, 3100 lumens).
Narrow spot:
Wide angle:
Approx same as BigBlue:
The Big Blue may actually put out more light, but there's a lot of spread outside the spot. This is what I don't like about it - the spot gets lost very easily. My most recent dives have been with buddies using Halcyon Flare and Light Monkey 21W HID. In a decent amount of sunshine, my TL3100p is invisible compared with those. In darker environments, it is workable, but I still wish for a more focused spot (which I now have).
Planning day and night dives Saturday for further testing. I'll report back!
Narrow spot:
Wide angle:
Approx same as BigBlue:
The Big Blue may actually put out more light, but there's a lot of spread outside the spot. This is what I don't like about it - the spot gets lost very easily. My most recent dives have been with buddies using Halcyon Flare and Light Monkey 21W HID. In a decent amount of sunshine, my TL3100p is invisible compared with those. In darker environments, it is workable, but I still wish for a more focused spot (which I now have).
Planning day and night dives Saturday for further testing. I'll report back!
Wow--that really is a square beam. Now I understand what people are talking about. I suppose there's no disadvantage to a square beam, but it would take some getting used to.
sea_otter
Contributor
Just for @stuartv, I did some rough measurements on beam angles.
The narrow focus, there's two distinct light beams. The very very bright square, and the circular halo around it.
The beam angle of the square is between 5 and 7 degrees, depending upon how you define the radius of a square.
The beam angle of the circle halo surrounding it is 14 degrees.
For the wide focus, the beam angle is 55 degrees.
Add a margin of error for the tape measure.
The narrow focus, there's two distinct light beams. The very very bright square, and the circular halo around it.
The beam angle of the square is between 5 and 7 degrees, depending upon how you define the radius of a square.
The beam angle of the circle halo surrounding it is 14 degrees.
For the wide focus, the beam angle is 55 degrees.
Add a margin of error for the tape measure.
sea_otter
Contributor
And there is one light emitter along with the focusing lens, which is very apparent in the earlier photos where you can clearly see the square shape of the LED. I don't know what kind of LED chip. I bought it because buddies were raving about how visible it was underwater, not because of printed technical specs.
I'd be curious to see how it stacks up to the new Light Monkey variable focus canister.
lucca brassi
Contributor
Cree led - only one sensible choice 
No way XHP50
Maybe I'll upgrade my DIY light (actually no need but like to fine tune performance)
No way XHP50
Maybe I'll upgrade my DIY light (actually no need but like to fine tune performance)
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