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Search: Posts Made By: BarraCuda™
Forum: Articles, Resources & FAQs 10-10-2006, 10:30 PM
Replies: 59
Views: 127,206
Posted By BarraCuda™
If you dont know the voltage then how do you know...

If you dont know the voltage then how do you know the wattage? The formula is given to you. Wattage = Voltage X Ampere
The higher the voltage, the brighter the LED. Grab an LED, connect it to 1.5V...
Forum: Articles, Resources & FAQs 10-10-2006, 02:01 AM
Replies: 59
Views: 127,206
Posted By BarraCuda™
Please correct me if I'm wrong, lux is measured...

Please correct me if I'm wrong, lux is measured as lumens per meter square. Please kindly show me how a very bright spot will have high lux whereas the rest of the dark meter square area is outside...
Forum: Articles, Resources & FAQs 09-10-2006, 11:21 PM
Replies: 59
Views: 127,206
Posted By BarraCuda™
Dont take my word for it. Ask the manufacturer...

Dont take my word for it. Ask the manufacturer for the lux rating. See if that particular light fixture is made for spot lumination.



I agree with that. So you will need alot of narrow beam...
Forum: Articles, Resources & FAQs 09-10-2006, 09:37 PM
Replies: 59
Views: 127,206
Posted By BarraCuda™
If you are talking about aquarium lighting, I...

If you are talking about aquarium lighting, I dont see why light distribution shouldnt be taken into consideration.

Whats the point of having 135 lumens when it can only deliver that value on a...
Forum: Articles, Resources & FAQs 07-10-2006, 07:11 PM
Replies: 59
Views: 127,206
Posted By BarraCuda™
This is a narrow beam spotlight, it produces a...

This is a narrow beam spotlight, it produces a very bright spot thats why they "claimed" to be so bright. If you spread the beam, it would be rather dim.
Forum: Articles, Resources & FAQs 07-10-2006, 01:13 AM
Replies: 59
Views: 127,206
Posted By BarraCuda™
That is considered very cheap. Each MH bulb...

That is considered very cheap. Each MH bulb costs $110 and I change them every 9months. The 2 replacement bulbs alone is already enough to cover the costs of $140/year.

Not to mention I also...
Forum: Articles, Resources & FAQs 07-10-2006, 12:28 AM
Replies: 59
Views: 127,206
Posted By BarraCuda™
Its difficult to give an definite answer. ...

Its difficult to give an definite answer.

However, its not just the refraction between air/water. The LED reflector have light loss, the glass lense will reflect some light back into the LED and...
Forum: Articles, Resources & FAQs 06-10-2006, 11:36 PM
Replies: 59
Views: 127,206
Posted By BarraCuda™
I dont see much of a problem if the heat issues...

I dont see much of a problem if the heat issues are properly engineered. The lumens depends on the voltage driving the LED. The max voltage for 3watt luxeon should around 3.7volts, whereas 55lumens...
Forum: Articles, Resources & FAQs 06-10-2006, 10:45 PM
Replies: 59
Views: 127,206
Posted By BarraCuda™
LEDs can be very bright if focused into a narrow...

LEDs can be very bright if focused into a narrow beam. However, if you want to light up the whole tank, you will need alot more LEDs spreaded out. LEDs lose alot of intensity if used as a wide...
Forum: Articles, Resources & FAQs 06-10-2006, 10:41 PM
Replies: 59
Views: 127,206
Posted By BarraCuda™
Thats why I dont agree that 1watt LED can produce...

Thats why I dont agree that 1watt LED can produce 170lumens, its simply not possible with the current technology.

Currently philips luxeon are the industry leaders in high power LED and lighting...
Forum: Articles, Resources & FAQs 06-10-2006, 10:04 PM
Replies: 59
Views: 127,206
Posted By BarraCuda™
Based on your article, they are using an array of...

Based on your article, they are using an array of 24x 1.2watt Luxeon LEDs to get 800lumens. Using basic calculation that will be an total of 28.8watts for 800lumens or 27lumens/watt.

Luxeon LEDs...
Forum: Articles, Resources & FAQs 06-10-2006, 07:16 AM
Replies: 59
Views: 127,206
Posted By BarraCuda™
I dont quite get it, it consumes 1watt of power...

I dont quite get it, it consumes 1watt of power and gives out 17watts of light? = 170lumens?

FYI, a luxeon 3watt LED only have an output of 55lumens.
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