Cree led par ratings....

[Troylee]

Anyone have par readings from a diy fixtures??? Also I'm hearing royal blues have higher par than cool whites.... Can anyone confirm this????

 

[FiReBReTHa]

:) posting my par numbers now :)

 

[Troylee]

anyone know if the claim is true that blue have higher par then the white xre???

 

[JackoChang]

I hear that they do, but you ned to put a blue filter on the sensor to get accurate blue readings.

Sent from my DROIDX using Tapatalk

 

[btkrausen]

Tagging along, as I'm thinking about doing my own DIY fixture very soon.

 

[swannyson7]

I'm on the waiting list for my club Apogee meter, so I'll post once I get it. No idea if that will be a week or 6 months though....

 

[CJO]

I have PAR readings from mine. I'd be glad to post them, but I'm not sure how relevant they are to anyone else. What are you trying to figure out?

The blues are more efficient that the whites, so they do put out more PAR at the same amperage. The Apogee PAR meter reads the blues' PAR output a bit lower than what they are. Do not put a blue filter on the sensor, it would exacerbate the problem.

CJ

 

[CalmSeasQuest]

I'll have to dig up my PAR measurements, but based on measuring my my AIs, with an Apogee MQ-200, the Blues were not higher PAR, but were very close. The variable is PAR meters underestimate very blue light, so it's probable actual output is higher. While not DIY, here's a photo of AI SOL Whites (Cree W/W/B) running side-by-side SOL Blues (Cree W/B/RB) that may provide some comparison. Both are running 40 degree optics. Note the Blues actually delivered more PAR to depth.

 

[Troylee]

Those are pretty good numbers considering there isn't many LEDs... I can only imagine what mine does at full blast it has 150 LEDs lol... Right now I'm running my fixture at 40 percent and in 10 days I have started bleaching stuff..... I switched from radiums with pfo ballast that pulled 1400 under the bulb...

 

[Just Clownin Around]

I'll have to dig up my PAR measurements, but based on measuring my my AIs, with an Apogee MQ-200, the Blues were not higher PAR, but were very close. The variable is PAR meters underestimate very blue light, so it's probable actual output is higher. While not DIY, here's a photo of AI SOL Whites (Cree W/W/B) running side-by-side SOL Blues (Cree W/B/RB) that may provide some comparison. Both are running 40 degree optics. Note the Blues actually delivered more PAR to depth.

are these running at 100%.

 

[gqjeff]

Yes I used 400 watters over 10 yrs. I have used the ai's for the last year and they will def toast sps and Montis unless you take it slow and ramp them up over time. These numbers are very very similar to the ones I took when I first got the ai's with the clubs par meter. I have read somewhere the blues r underrated like 20% on the par meters. I ha since added a 26 led 3 watt Cree diy of royal blue. Have the sol whites so added some royal to the mix. So I have not tested since adding them by they r crazy brite. They r dimmable also like the ai's off the ghl.

 

[CalmSeasQuest]

are these running at 100%.

Yes. Both units are shown at full power and are suspended 18" above the water line. I estimate the PAR meter error rate to be ~20% low.

 

[Billgax]

The royal blues have a higher PAR per watt than cool whites because the cool whites "waste" more energy in less relevant spectra to photosynthesis. The chlorophyll a and b absorption peaks are on either end of the visible light spectrograph (blues and reds)... "white" is a mix of various wavelengths...