I could use some help finding the brightest LED – or it could be a small array of LEDs – that I can source to flash VERY brightly for a short time (30 minutes or less, mostly just a few seconds at a time) within the following constraints: 9W peak draw of LED circuit, 10-12Hz flashing, min 1000 lumens, available PCB area about 0.35" x 0.95" 0.715" (includes mounting holes). (Said PCB is basically sitting on a piece of anodized aluminum.)
My predecessor on this project did a first-pass bench test of a CREE XLamp MHD-E part (7x7mm, 9/18V, 4000k, 1005 lumen at temp) that may have been acceptable, but brighter is better and I know the first feedback we get is going to be “can it be brighter?” so I want to find out…
Any general guidance – pointers to references, etc. (note that I did give this a read-through: Choosing the correct LED and LED Driver) – would be appreciated!
Hello,
Thank you for your post.
I was not able to find anything brighter than the MHD-E in the available footprint you mentioned.
One thing to consider is using a reflector/lens combination to focus the light you already have or to increase the light you have without switching leds.
I’d start the search by paring down things on the basis of the minimum required luminous efficacy–you’re not going to make the target without at least 111lm/w. A person can then select packages that fit into the overall footprint; all else one’s generally going to be better off with a single device, rather than the extra packaging involved when using separate devices. But all else might not be equal… Then one can pare down by nominal flux levels; you’re not likely to get to 1K by 40s, for example… Then ask yourself if you’ve got a bit of wiggle room dimensionally. And of course, ask yourself whether or not available stock is a need…
Offhand, it looks like a person could fit 3 of the JR5050BWT-K-B40EB0000-N0000001 in the stated space quite comfortably, and discounting the quoted efficacy figure a bit, 1500lm could be attainable on your power budget.
As for driving, there’s all sorts of options depending on one’s needs & preferences. The more space constrained and desirous for a plug & play solution one is, the more constrained things tend to be. One can play tricks with smearing “peak” into “average”, such that one’s instantaneous power available on a pulsed basis is rather larger than the average figure, allowing potential for instantaneous brightness to increase in inverse proportion to the desired duty cycle. And of course, thermal management is a thing one has to consider as well.
Some further insight as to your specific needs would be helpful in terms of providing more specific suggestions.
Some subsequent research confirmed the likelihood of the mentioned J-series device, but also suggested the XPGDWT-01-0000-00ME3 as an alternative approach; their smaller size permits a larger number to be fit into the available space, yielding an array with significantly greater power handling capacity.
