Safe current for SST20(WxH J4) hiCRI 4000k and Nichia 219c d240 hiCRI 4000k and Samsung LH351D 4000k hiCRI?

Aprilis · 2019-07-04T09:04:03.000Z

Hello.

I am struggling with my first mod and I am stuck on selecting appropriate current levels for these diodes. I would like to know if it is safe to drive them with 3000 - 3200 mA current?

Lexel · 2019-07-04T10:23:04.000Z

all 3 absolutely save on DTP LED board

Aprilis · 2019-07-04T12:29:57.000Z

Lexel:

all 3 absolutely save on DTP LED board

Thanks a lot.

Are DTP MCPCBs from Kaidomain fine?

moderator007 · 2019-07-04T14:27:03.000Z

This I how estimate where I want to be with current or just to see how many lumens I should be making at a certain current. A few members here have already give us a guide with their led test data. Most test are done on copper mcpcb attached to a big chunk of aluminum, usually the tester has provide the information on how the test was performed in the data.

Samsung LH351D 5000k LED output test by Texas_Ace - Amazing output, low thermal resistance but high Vf Flashlight Modding and DIY Parts

kiriba-ru sent me these LED’s to test. I had never even heard of them before so I didn’t hold out a lot of hope for them but they really surprised me! They have one of the lowest apparent thermal resistance I have seen so far. This can be seen in how the output hardly jumps from a cold start, that says it is moving the heat away very efficiently. The output is also very impressive at over 2200 lumens! This is more then any other 3V LED I have hot tested. The XP-L2 will make a bit more from a co…

Luminus SST-20-W 4000 K CRI95 color and output test Flashlight Modding and DIY Parts

I got this emitter from Kaidomain on a 20 mm MCPCB. [image] Mounted on a CPU heatsink with a nice splash of thermal paste and over the top 16 AWG wires. [image] Purchase link: http://kaidomain.com/Luminus-SST-20-J4-FB4-Neutral-White-4000K-LED-Emitter?search=Luminus%20SST-20 Data sheet. Exact order and bin code: SST-20-W40H-A120-J4FB4 VH Where SST-20=self explanatory W=white LED 40=4000 K H=CRI 95 A=solder pad configuration (3.25 x 3.25 mm) 120=viewing angle, 120° J4=flux bin, 107-1…

Nichia 219C D260 9050 90+ CRI Emitter output test by Texas_Ace Flashlight Modding and DIY Parts

Here is another emitter test for ya’ll.” Djozz has already tested the 83cri D280 219C”:Nichia 219C, testing a 5000K 83CRI emitter, comparing with a XP-G2 S4 2B and other leds so there is not a lot of reason for this test other then I felt like it. It basically follows djozz tests just obviously with lower output. Not a lot to say about it, same sphere setup as my other tests. The real key with this LED is the tint and CRI. In a reflector it is good but in a TIR it is simply amazing. Something …

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If using a direct drive driver or FET driver you can also look at battery discharge graphs to match the vf of the led at a certain current to estimate the output of the led.
Say you have a battery that at 5 amps of load sags to 3.7v, now go look at the led test data and see where the vf becomes 3.7v if its at a current of around 5 amps then that’s the estimated output. As long as the battery voltage is above the vf of the led the current will climb until they meet or the led blows if its more than the led can stand in direct drive. With direct drive or FET your looking for the place where battery load voltage is equal to the led load vf at a certain current. The test data is a very useful guide.

Aprilis · 2019-07-06T21:48:40.000Z

moderator007
Thank you very much. Your explanation helped me a lot.

mrheosuper · 2019-07-07T08:49:52.000Z

Aprilis:

Lexel:

all 3 absolutely save on DTP LED board

Thanks a lot.

Are DTP MCPCBs from Kaidomain fine?

They are good, i’ve used some of them in my mod, the only problem is they are a little thin, so it may messes with your focus point