550kcd+ Emisar D1Sv2 coming this month!

550 kcd = 550,000 cd = defined as the brightness at 1meter distance
Throw distance is defined as the distance at which the brightness is reduced to 0.25 cd (=about moonlight illumination)
So at throw distance the bightness has decreased 550,000 x 4 = 2,200,000 times compared to 1 meter distance
Brightness decreases with the square of the distance, so we need to take the root of 2,200,000 to arrive at the throw distance, this is 1483 meter.

throw=sqrt(cd/.25)
so 1483.23969742m

But the lower temperature tint bins are above the BBL unfotunately. Has anyone tried the Kaidomain one to see if it is more greenish?

0.5 or 1 lux is more pratical, 0.25 lux is barely visible in most cases

I will definitely be looking at those when they are released. I have a decent collection of Emisar’s.

What will be the lumen output? Around 1500 lumens? Gonna be a pencil beam.

My guess would be 800-1000 lumens, but that is very generous. the chip is rated for 800 lumens with a max of 1000 lumens

This is true, but the standard specs use 0.25 lux. So people stick with that, to make numbers comparable across the entire industry.

Yes, it will probably be the pencil-est of pencil beams. At 550 kcd and maybe 800 to 1000 lumens, that’s 550 to 687 cd/lm. So the beam will probably be even tighter than the BLF GT. It has slightly more cd/lm and the reflector is smaller, so we can expect this one to perform extremely well at a distance but won’t really be useful up close.

Basically, it’s optimized specifically to be as “pencil beam” as possible.

If this ends up being offered with an XHP35 Hi I might be interested, even though I really don’t need another thrower.

It’d be interesting to see how far the K75 shone until it recorded 0.01 lux. I’ve seen it hit white buildings at well over 3000m

Would be great to see the light offered with XP-L HI and SST-40 as well for more options in beam profile and tint. A CC driver hitting ~5-6A at max would be perfect for those as well.

That my new lesson today. Tq, appreciated it.

  • KCD to distance(meter or km)
  • beam profile which is candela/lumen(cd/lm) in this case, cd is really intense while lumen is moderate, thus generating a pencil-look-like beam

Hank said the head is 70mm. Doesn’t 550kcd seem a bit less for that size?

Yes, the metric used to quantify beam shape is “cd/lm”. Here’s a rough guide for what that means.

Assuming XP-L HI in each light (except D18 and D1S V2), Emisar’s products go in this order from most floody to most throwy:

  • light bulb: ~0.1 cd/lm
  • D4: ~4 cd/lm, ~4300 lm
  • D18: ~4 cd/lm, ~14000 lm
  • D4S: ~11 cd/lm, ~4500 lm
  • D1: ~33 cd/lm, ~1300 lm
  • D1S: ~100 cd/lm, ~1300 lm
  • D1S V2: ~600 cd/lm?, ~800 lm? (TBD)
  • laser: ~10000 cd/lm

For general-purpose “EDC” style use, people mostly like items in the range of roughly 3 to 30 cd/lm, with the D4S’s 11 cd/lm being a very versatile balance. The D4S is a bit large though, so I’d really like something D4-sized or smaller with a single emitter and a ~10 to ~15 cd/lm beam.

I generally use the D4 most because it’s the smallest and has a clip, but the D4S has my favorite beam of the bunch. The D1 is also handy since in 18350 form it’s small enough to forget about in my purse until I need it, and it’s throwy enough for almost anything I ever need.

With D1S and D1S V2, they’re extremely good at what they do, and are unusually compact for the amount of throw they achieve… but it’s rare that I ever need or want that much throw. For people who do need it though, it’ll basically leave almost everything else in the dust, especially for the price.

He also said there are no plans fora SBT90 Gen2 version

550 kcd sounds right. I have a 72mm head with a oslon black and it only does 550kcd.
But I wish he would give us a rear clicky. Side clicky are nice if it was a high output thrower. But for a pencil beam dedicated thrower, a rear switch is better imo.

Rear clickies have two disadvantages: restricted UI choice and internal switch resistance.

That 1st point is obvious.

That 2nd point is having a good enough switch to support high current is quite expensive. Well, compared to an electronic switch anyway.

There’s something less obvious though: standardization for Emisar lights.
By only using e-switches, it makes it easier for them in terms of making stuff, and less overall costs.

I’m sure there will be a Skylumen version with the SBT90.2

If we look at LED price comparison e.g, sst40.sst20, nichia, xhp35, xhp50.2, xhp70.2, osram WF, XPL…vs the SBT90.2 :open_mouth: :open_mouth:

When it come to about, making profit…everything must be lower price as possible as cheaper as it is!

Well he can just price it higher. I’ll happily pay even $85 for it. The performance of that thing is crazy…slightly more throw than an XHP35 HI with over double the output.