bluesea

Can you provide the exact link to the review?

Thanks for the recommendation. What's the price and weight?

This new LED light will make you smile when your next electrical bill come! Continuing to use your existing conventional lighting will raise your expenses by 12.5% in Q4.

Frankly, I am quite lazy to do such technical stuff although it's good to learn many things from sherman and from others in DIY team. Thanks.

Yes, I fully agree that your above first point. Light intensity will greatly reduce as distance from LED increase, and etc. The wider the beam angle, the worse the light intensity as distance increases. According to some studies, a plain glass will contribute a loss of 5% light intensity, so adding an external object (such as lens), will only make it worst. I guess lens is just for people who don't have a choice to buy the LED according to the desired beam angle they want. Manufacturers have ways to customize beam angle for LED in order to do without the lens, and also save on product and process costs.

Let’s do some maths. Tank length: 48†Light Length: 39.5†The furthest distance for both ends LED (est.): 38†So the distance from one end of tank to one end of light is (48 – 38) /2 = 5â€. Beam angle: 90 degree. Apply right-angled triangle rule, the height between water level to light = 5 x tan (90/2) = 5â€. This is the height for lamp that will cover your entire tank water level from left to right. You can do same calculation for finding the height for cover your width of tank. Hope it helps. However, usually the aquarium aquascape design will not have corals at the far end of each side. Don’t worry if the light can’t cover the 100% of the water at the top.The light coverage area will expand as it goes deeper, provided the light intensity is sufficient. So don’t place the lamp too high as it lose intensity. Also, there should be some safety height to minimize water splashing on it and water vapor should also be taken note. Correct me if I'm wrong. Bluesea

Hi Sherman bro, My light is 1 meter or about 39.5 inches but my tank is 4ft (48 inches). But normally we keep a distance from water level and LEDs have beam angle, so it will be covered all place at certain height. Not too high else will lower the brightness. Check the last photo which shows the light on above the tank.

No, I am just an individual trying to sell off a spare brand new lamp

Note that there is a small dent on the surface, about the size of a 5 cent coin that is not very obvious.

Are you still using aged old metal halide to boil your aquarium tank 8 hours every day? Adding more heat into tank to stress your corals? Making your chiller working restlessly and doubly hard to pull out the heat from your tank? Exchanging the heat from the water to circulating hot air around your family in the most relaxing living room? Do you find it entertaining enjoying your lovely mini reef world at your home at the same time with Singapore’s tropical warm temperature? Are you still paying high electricity bill generated by unwanted heat? Here come the LED age to rescue aquarists, by getting rid of hot metal halide and traditional hot bulb and lighting tubes. Traditional Light cons: Generate unwanted high heat, fragile, emit UV, short lifespan, intensity degrade relatively fast, 360 degree view angle mostly not hitting on target, therefore reflector is needed; reflector adds up to your costs, occupy space , loss of light intensity caused by non ideal reflect rate and cannot be instantaneous on/off, etc. LEDs are effective, energy-saving, reliable, low heat generating solid state lighting device, giving shimmering effect, provide excellent results and lower operating costs for aquarium. LED array have more lighting points, thus it gives constant intensity across tank much better than a 2-spotlight like metal halide. I’m letting go below LED light, because I’m currently using another one similar. Below are the specifications and pictures for illustrations: ----------------------------------------------------------------------------------- Power: 156w (May equivalent to 300w metal halide or 2x 150w metal halide) Colors: 50% Blue (460nm) + 50% White (10,000K) LED Qty: 52pcs LED Power: 3w (Good penetration power for deeper tank) LED Life: 50,000 Hrs View Angle: 90 degree (designed to cover standard width and deeper tank) Size: 1,000 x 115 x 115 mm (slim and compact, suitable for 3-4 ft tank) Weight: 7kg Chassis: Grey, Aluminum Mounting: “C†Hook for hanging Condition: Brand New Qty for sale: One (Sorry, only one piece left for this model, act fast!) Price: S$1,200 (Very good deal in terms of dollar/watt = S$7.70/watt; slightly more than retail cost price for DIY) Delivery: Free for Singapore Term: Cash and Carry, 7-day Money back guarantee with 10% processing fee. 156w LED - Light-off and light-on pictures taken without changing room light, front view with 2 “C†hooks. 156w LED – side view: Left – without external cover, the internal look, good quality heat sink and fan ventilation to ensure many years to come. Right –with cover 156w LED – light on with closer look but away from view angle. The light beams are focused without using reflector and eliminate wastage of out-of-target light. The plain glass (non acrylic) panel not only eases maintenance, it also ensures transparency for a long time, to deliver maximum light output. 156w LED – on operation at 48x24x30 inch tank Grab it now before it land on other people hands.