GB 351D closed.

My Ledā€™s arrived today as well. Managed to get one in a Rofis TR20. What a PITA, totally worth the effort though.

Smoothed out the beam, tint is perfect and colours look better than both my 90cri 219c lights.

The two notches in the thermal pad indicate the negative side.

One down, thirty nine more to go.

I received the leds today, 4000k 90CRI
Damn, this thing is so good, the tint makes the cree ashame and can stand next to glorious Nichia
No greenish, not much tint shift
I tested with BLF a6 host, spring bypassed, and hereā€™s the result(lg hg2)

I also have an A6 I plan to install one of these in.

Off topic I know but quick question: Are there any good 5050 LEDā€™s on the market besides the XM-L2? I have a light I want to upgrade the LEDā€™s in but it uses a custom 4x XM-L2 mcpcb that I could not easily replace. I would prefer not use xm-L2ā€™s.

SST-40 mostly.

Or maybe Luxeon V if you want to buy MCPCBs from Led4Power, since it is in the 4040 footprint.

Both are excellent 3V 5050 LEDs

Luxeon V is 4040 LED.

recieved your led today :slight_smile:

will reflow them on weekend.

kaaaaaachinggggggggggggggg :smiling_imp:

Just installed 3x LH351Ds in my C8F from the last batch and shipments. They look too cold, I knew it at first sight. I've compared the beam against a 30Ā° TIR equipped S2+ using a known good LH351D 4000K CRI90+ from the first set of shipments, I must have received 5000K CRI70+ emitters.

Could you please confirm if possible, AEDe? Thanks.

Theoreticaly I can made a mistakeā€¦
Could you send me macro photo of 351D 4000K from first butch together with ā€œ351D 4000Kā€ from last one?

colors of luminofor of 4000K is very differ from colors of 5000K ones

If is really 5000K, I ll resend 351D 4000K to you.

After a quick glance at 'em they look pretty similar. Will take a shot or two out of their strip packages later. Optics from the above flashlights are completely different, thus the comparison isn't fair. Colors look good but I don't have a known low CRI emitter flashlight :-D at hand now. Got me alarmed, though.

Will have to wait a bit for now, thanks.

Cheers :-)

5000K has yellow luminophore white 4000K has a bit orange one.

Put them under UV light, like 365nm and theyā€™ll show you if theyā€™re a difference :

No need for photos, they're definitively orange. In fact just noticed the only unused and not orange looking emitter I have in my cardboard :-D cache emitter box is one of those 5000K CRI90+ XP-G3s (1 out of 46).

The second batch is an L6 chromaticity bin, ā‰ˆ125K cooler than the first (L7). I am impressed by how much a reflector can influence the final perceived tint, beam corona looks yellowish while hotspot and spill are a noticeably cooler white.

Thanks all for the input.

Hence the dreaded ā€œfried eggā€ beamā€¦

Yellower center/hotspot, bluer outside/spill.

Okay, now I want some fried eggsā€¦

Well, sort of Lightbringer. The hotspot is sort of yellow, the corona is yellower and the spill is of a cooler temperature.

:-)

Yeah, I got a bunch of lights where the corona is lemon-yellow while the hotspot is also yellowish but not nearly as much, and the spill is blue-white.

The LH351D certainly doesnā€™t like larger SMO reflectors.

Mine arrived today

How does the tint on the new batch compare with the old? Is it greener or less green? The tint batch is supposed to be below the BBL?

Anyone have an idea or guess how the Vf of the 351D 4000K 90CRI emitter compares to the Vf of the 219CT 5000K 90CRI emitter? I put 2 of the Samsung and 2 of the Nichias (from a D4) in a Q8 and visa versa. My impression is that output decreased a little in the D4, but tint, CRI, and throw improved. I don't want to push the Q8 too hard due to the 3 additional cells. I did turbo a bit and detected on no blue tint warning of overheating. I'm not a good judge of output, tint, and CRI by eye though. I'm assuming the CRI didn't actually increase, but it appeared like it did to my eye.

I really like the combo tint and CRI wise, but I don't want to fry one set of emitters due to significantly lower Vf. I really need to setup a heat sink with light tube and test each emitter, but I'm hoping someone in the know already knows.

EDIT: Clarified wording.

EDIT2: Caught typo (strike out above). Sorry for all the edit's folks.

Mine arrived yesterday, forgot to check the mail :person_facepalming: Thanks!