Lighting If you had $5000 to blow on leds for your room - what would you buy?

[pop22]

well, your statment on pricing needs qualifying. The Citizen CLU048 1818 is aabout 40% cheaper. The 1825 is around the same price as the 3590

There is actually a big difference between the 2 kits. Tasty is running the cobs very hard close to 2.1amp to hit a higher wattage. Timber is running their cobs at 1.4amp. 4 cobs vs 6 in timber. I regularly build lights and suggest 8 cobs if the goal was 300 watts based on the fact that the lower the amperage re more efficient it would be. There is a 6% efficiency drop, shorter life span which shouldnt matter to much and your going from 167 lumens per watt down to 148 line a per watt. . But it makes more light and is more efficient at higher wattage than a 3590. With the difference in driver requirements, prices really about even out with the 1825. The 1818 based light will be about equivalent to a 3590 based light and be 15-20% cheaper, still a good savings!

To make things even better if you were to swap the Cree cobs for similar efficiency and go with citizen and just about cut timber price in half.

 

[pop22]

after some checking a 100mmx70mm should dissipate about 70 watts of heat @25C and 59 watts @35C. I had a thought, maybe the mounting surface is not level, the TIM isn't filling the gap(s), etc. He's right that the sink should not be that hot. I'd check the contact area between the heatsink and the cob

Hi @BigSm0

Thanks for your post. Prices on Cree LEDs have gone down - that said, Timber pricing has never been based on retail component pricing as we have always purchased at the levels we currently purchase at, and what our kits pricing are based upon. I understand there are lower priced solutions - and that is fine. We handle the top bin Cree CXB3590 as, again, they have been proven to produce great results. Our kits contain features that other companies do not such as 10 amp fused power inlets and waterproof electrical interconnects. Safety is always critical in the design and testing of all of our products.

The heatsink temps when measured with an infrared laser thermometer are 120-130 deg F after being in operation for greater than 15 minutes. This is the maximum we have measured. Of note, and something that we always recommend to LED users, is to run a small fan that blows air across the pins of the heatsinks. Doing so will reduce your ambient heat sink temps to 80-90 deg F. Most grow environments already have active air movement which is usually sufficient. Also worth noting, the thermodynamic cooling performance of the Cooliance Pin Heat sinks really excels above the competition when there is air moving across the pins as a result of their trademarked design.

I hope this helps to clear up any confusion.

Have a good evening.

Regards,
Dan

 

[BigSm0]

after some checking a 100mmx70mm should dissipate about 70 watts of heat @25C and 59 watts @35C. I had a thought, maybe the mounting surface is not level, the TIM isn't filling the gap(s), etc. He's right that the sink should not be that hot. I'd check the contact area between the heatsink and the cob

That is their rating based on an 80% efficient source.

Page one looks like it's a perfect fit. The thermal performance chart on page 2 shows @50w 40c above ambient, @70w 60c above ambient.

40c =104f plus a 78 degree ambient temperature puts the heatsink at 182 degrees. At their rating of 73 watts would put the heatsink well over 200 degrees. Now my concern came when I nearly melted my skin off on the smaller sinks. My 50w on the sst-120 is bearable. I don't think these numbers are within acceptable ranges

 

[pop22]

ahh, sorry, I missed that data

That is their rating based on an 80% efficient source.

Page one looks like it's a perfect fit. The thermal performance chart on page 2 shows @50w 40c above ambient, @70w 60c above ambient.

40c =104f plus a 78 degree ambient temperature puts the heatsink at 182 degrees. At their rating of 73 watts would put the heatsink well over 200 degrees. Now my concern came when I nearly melted my skin off on the smaller sinks. My 50w on the sst-120 is bearable. I don't think these numbers are within acceptable ranges

 

[jayp]

@Markus check out Vividgro.com. They have a great deal going on were you can pay so much down and test their new led's a no if you don't like them send them back no questions asked for refund. I have seen a lot of growers both commercial and just closet growers use their light with awesome results. I've been watching them on instagram and plus have talked to them personally and they back up their products100%. I've seen commercial greenhouses using their lights with awesome results. I'm not a spokesman for them just trying to let you know all the new products out there.