Emisar D3AA is available now

[iamlucky13]

@Hank Wang

@iamlucky13

@contactcr

@gregor

Why is E21A so special?

Why shold I buy this LED?

Which version of 4 available will you buy?

If having the highest CRI is your #1 attribute then you would want this. If you value output/efficiency/beam profile above CRI then you may be better served with a different LED, just depends on use case.

Color temp is personal preference but since he has a few to choose from you could combine them to make nearly anything between 2200K and 5000K

Agreed.

Expand a little more on those tradeoffs:

The E21A can’t handle as much current as other options, so the KR4 with these emitters is limited to 5Amps (no FET), which produces about 1200 lumens (for the 5000K version). Other emitters that can run with a FET to current output can produce 3000-4000 lumens in the KR4.

The first sample of the KR4 that went out for review with E21A’s in it had visible tint shift with the stock optic. A frost optic mostly fixes this, although makes the beam wider and less throwy.

The efficiency of the E21A emitters is good for such a high CRI emitter. However, a low CRI emitter is capable of something like 30% higher output.

The frost 10623 is the default optic for the KR4 E21A version, instead of the clear 10622 optic.

Good choice. Thanks for the update!

[jojosupir]

sorry if the question had been asked before,Do emisar d4sv2 Ti will have e21a option also?

[gregor]

Thank you for your answers regarding E21A emitter.

[MNLegoBoy]

Hank will the green and cyan d4sv2’s come back in stock, or were they a limited run

[pol77]

Hank, can’t the E21a be driven with partial FET, like the 219b?

Any plans to put E21a in D4V2 Ti?

Any plans to make a Ti KR4 with E21a?

Thanks for your time.

[srvctec]

@Hank Wang

All the KR1 order will be shipped within this week.

Hank, I never got a shipping notice for my KR1 order placed 5/28. Did they all get shipped already or have some not yet shipped? Thanks!

[KalmJ]

Hank,
Any ETA on the new clip?
Wanting to purchase an e21a KR4 and a W2 KR1 but would prefer the new clip.
Thanks.

[Hank_Wang]

@MNLegoBoy

Hank will the green and cyan d4sv2’s come back in stock, or were they a limited run

I’m afraid they are limited run.

[Hank_Wang]

@KalmJ

Hank,
Any ETA on the new clip?
Wanting to purchase an e21a KR4 and a W2 KR1 but would prefer the new clip.
Thanks.

The clip design has not been finalized yet, I’m afraid it will take at least 2~3 months before it can be available.

[Hank_Wang]

@pol77

Hank, can’t the E21a be driven with partial FET, like the 219b?

Any plans to put E21a in D4V2 Ti?

Any plans to make a Ti KR4 with E21a?

Thanks for your time.

E21A can not be driven even with partial FET. There will be Ti KR4, but no E21A in D4V2 Ti.

[jojosupir]

@Hank Wang

E21A can not be driven even with partial FET. There will be Ti KR4, but no E21A in D4V2 Ti.

Ordered Kr4 e21a,will order Ti Kr4 e21a(hopefully Ti body with copper head design) as soon it become available.Thanks for your time answering our questions.

[SammysHP]

@srvctec

@Hank Wang

All the KR1 order will be shipped within this week.

Hank, I never got a shipping notice for my KR1 order placed 5/28. Did they all get shipped already or have some not yet shipped? Thanks!

I haven’t got any shipping notice for my KR1 order from June 4 as well.

[Nguyen]

Ordered KR4 Warm White 3500K.
Thank you Hank.

[Hank_Wang]

@Nguyen

Ordered KR4 Warm White 3500K.
Thank you Hank.

For your reference, we are not able to send packages to Hawaii, Alaska, except via DHL with extra shipping fee.

[pol77]

Thank you for all the information Hank!

Will you be getting 3000K E21a as well? Or any other tints.

[TebeC]

@SammysHP

@srvctec

@Hank Wang

All the KR1 order will be shipped within this week.

Hank, I never got a shipping notice for my KR1 order placed 5/28. Did they all get shipped already or have some not yet shipped? Thanks!

I haven’t got any shipping notice for my KR1 order from June 4 as well.

I too have not yet got any shipping conformation for a KR1 I ordered on May 31

edit: just got a shipping conformation

[Wurst_Nightmare]

@iamlucky13

[…] Agreed. To expand a little more on those tradeoffs: The E21A can't handle as much current as other options, so the KR4 with these emitters is limited to 5Amps (no FET), which produces about 1200 lumens (for the 5000K version). Other emitters that can run with a FET to current output can produce 3000-4000 lumens in the KR4. […]

I'm just getting deeper into this topic, so please excuse me if this is a FAQ:

I'm trying to wrap my head around the whole "no FET" business. If understand this correctly, a common driver design is using a combination of linear regulators for better efficiency on lower brightness levels and a FET to switch a pseudo direct-drive straight from the battery for the top end. So when you're referring to "no FET" does this mean that linear regulators are used all the way up to the brightest output level? Are there physically no FETs populated on the PCB or are they bypassed in firmware?

Are there schematics available for the driver used in the KR4 or similar designs? I want to understand this!

[DHart]

I’m curious… would the look of the CRI with the E21A be noticeably better to the eye than the SST-20 with 95 CRI?

[pol77]

DHart, it is not just the CRI to be considered. It is also the tint. The E21a offered by Hank are all under or on the BBL, if I am not mistaken, while the SST-20 are above it. Also, the SST-20 have a notorious tint shift.

[Hikelite]

@Wurst Nightmare

@iamlucky13

[…] Agreed. To expand a little more on those tradeoffs: The E21A can’t handle as much current as other options, so the KR4 with these emitters is limited to 5Amps (no FET), which produces about 1200 lumens (for the 5000K version). Other emitters that can run with a FET to current output can produce 3000-4000 lumens in the KR4. […]

I’m just getting deeper into this topic, so please excuse me if this is a FAQ:

I’m trying to wrap my head around the whole “no FET” business. If understand this correctly, a common driver design is using a combination of linear regulators for better efficiency on lower brightness levels and a FET to switch a pseudo direct-drive straight from the battery for the top end. So when you’re referring to “no FET” does this mean that linear regulators are used all the way up to the brightest output level? Are there physically no FETs populated on the PCB or are they bypassed in firmware?

Are there schematics available for the driver used in the KR4 or similar designs? I want to understand this!

People call FET what is infact direct drive, most imagine a buck driver does not have a FET or for that matter it can have more than one FET easily after all it is a MOSFET.
You do not need a combination of linear regulator to regulate current ( maintain it constant as long as the Vin+voltage drop is above VF) just one linear regulator is enough and a FET is needed to achieve that.
A linear regulator is a regulator, not to be confused with direct drive that as a resistor in series just to limit current like it was done several years with flashlights, then they added a FET in order to PWM it for having modes.