Looking for High CRI (95) Natural/Full spectrum 5000-6500K LED strip

[PaulErik]

Not sure where the confusion on the Iwasaki bulb spectrum is now coming from. The original 250W and 400W 6500K used for reef lighting was the commercial Clean Ace branded 6500K designed for mercury vapor reactor and high reactance (HX) ballasts.

Models:

MT250DL

MT400DL/BH

MT400DL/BUD

Later on Iwasaki came out with the Clean Arc (also known as the Hortilux Blue for horticultural lighting) that was designed for CWA metal halide ballasts.

Models:

MT250D

MT400D/HOR

MT400D/BUD

Both are the same chemistry (rare earth based halide chemistry) and spectrum (6500K 90CRI). The only difference is the Clean Ace has a starting circuit (glow bottle switch and resistor) built into the bulb to allow it to operate with lower open circuit voltage (OCV) mercury vapor ballasts and the Clean Arc just has an auxiliary probe to facilitate starting (probe start) as do standard probe start metal halide bulbs.

Many years ago a supplier ordered/received the wrong bulbs. They supplied the Iwasaki Multi Metal bulbs. These were 4200K 65CRI (sodium scandium based halide chemistry). These were extremely yellow. I know that caused a lot of confusion back then.

 

[oreo54]

Not sure where the confusion on the Iwasaki bulb spectrum is now coming from. The original 250W and 400W 6500K used for reef lighting was the commercial Clean Ace branded 6500K designed for mercury vapor reactor and high reactance (HX) ballasts.

Models:

MT250DL

MT400DL/BH

MT400DL/BUD

Later on Iwasaki came out with the Clean Arc (also known as the Hortilux Blue for horticultural lighting) that was designed for CWA metal halide ballasts.

Models:

MT250D

MT400D/HOR

MT400D/BUD

Both are the same chemistry (rare earth based halide chemistry) and spectrum (6500K 90CRI). The only difference is the Clean Ace has a starting circuit (glow bottle switch and resistor) built into the bulb to allow it to operate with lower open circuit voltage (OCV) mercury vapor ballasts and the Clean Arc just has an auxiliary probe to facilitate starting (probe start) as do standard probe start metal halide bulbs.

Many years ago a supplier ordered/received the wrong bulbs. They supplied the Iwasaki Multi Metal bulbs. These were 4200K 65CRI (sodium scandium based halide chemistry). These were extremely yellow. I know that caused a lot of confusion back then.

There is also a review of the marine tweaked 6500k ( which is not 6500k) by Reef Builders.

Anyways my bad, thought it was around 10000k .

This new 41R bulb actually specs out around 7600K, but is still listed as 6500K.

#57787 - 250 Watt 6500 K Metal Halide Bulb - Japan | Premium Aquatics

Aquarium & Fish Supplies Superstore. Guaranteed Low Prices. Free Shipping for qualified orders. Aquarium supply for your aquarium fish, saltwater aquariums, freshwater aquariums and ponds. The best aquarium lighting, protein skimmers, aquarium chillers, calcium reactors, aquarium pumps for fish...

premiumaquatics.com

Made in Japan (Iwasaki MT250DL-E39/41R version for aquarium trade) Designed to run on Mercury Ballast, standard halide will run the bulb with little color or output loss. This new 41R bulb actually specs out around 7600K.

Sooo that's how I understand it ..2 versions of the 6500 k bulb... One cooler than the other. Or more specifically one especially for aquarium use

 

[PaulErik]

That’s exactly when the confusion happened. That was before the Clean Arc was introduced. People were only wanting the Iwasaki 6500k with the big resistor in the bulb to make sure they got the whiter (Clean Ace) version and not the standard (Multi Metal) bulb.

I was one of the people to clear that up with a certain distributor at that time. They sold them to many retailers without knowing the difference at the time.

 

[PaulErik]

Some retailers pushed the proper Clean Ace bulbs as a newer version but in reality a few batches were a completely different bulb, the wrong Multi Metal bulb. Iwasaki only made aquarium specific spectrum bulbs in 150w double ended, 150w single ended, 175w single ended and 250w double ended. The 250 and 400 watt single ended were from the commercial line. Iwasaki/EYE lighting international was trying to come out with 20K/blue (indium halide) 250w and 400w single ended bulbs in North America. I even used and tested some of those products.

 

[oreo54]

That’s exactly when the confusion happened. That was before the Clean Arc was introduced. People were only wanting the Iwasaki 6500k with the big resistor in the bulb to make sure they got the whiter (Clean Ace) version and not the standard (Multi Metal) bulb.

I was one of the people to clear that up with a certain distributor at that time. They sold them to many retailers without knowing the difference at the time.

Sooo they never made a 6500k especially for the aquarium industry?
And the 7500k- ish is a lie?
But there was a white vs yellower version?
,

Well either way, for fun. $10 each..

EYE Multi-Metal 250w Metal Halide Lamp MT250BH-E39/41R | eBay

<p>EYE Multi-Metal 250w Metal Halide Lamp MT250BH-E39/41R. </p><p>Purchased from a business that closed its doors after many many years</p><p>If you have any questions please ask</p>

www.ebay.com

 

[PaulErik]

Correct they never made a 6500K especially for the aquarium industry or even the horticultural industry. I remember it was a mess of misinformation back then.

 

[oreo54]

Correct they never made a 6500K especially for the aquarium industry or even the horticultural industry. I remember it was a mess of misinformation back then.

And it lives on via the internet ..

 

[PaulErik]

That eBay listing is for the yellow 4200K 65CRI (sodium scandium based halide chemistry) version that should never have been offered to the aquarium industry.

 

[PaulErik]

MT250BH is the yellow one 4200K
MT250DL and MT250D are 6500K

 

[oreo54]

APPARENTLY I added insult to injury.
SORRY ...
Can I claim my senior moment?

Long form?

What's the rest stand for after the base number e39?
41 another base?
M for metal halide
T for tubular
250w
Key of course is the D for daylight.



57787 is Iwasaki product code for the 250w 6500k tubular e39 based bulb..
Just to complete the reference.

 

[PaulErik]

Internationally the North American E39 mogul base is sometimes referred to as E39/41. The R is for:

"R WARNING: This lamp can cause serious skin burns and eye inflammation from shortwave ultraviolet radiation if outer envelope of the lamp is broken or punctured. Do not use where people will remain more than a few minutes unless adequate shielding or other safety precautions are used. Lamps that will automatically extinguish when the outer envelope is broken are commercially available."