HQI double ended vs. mogel socket
- Thread starter ti6al4v_15
- Start date
Double-end bulbs run cooler than single-end, creating less of a heat issue. They are also more efficient, offering higher output per watt (a 250W DE is the near equivalent to a 400W SE).
On the otherhand, double-end bulbs lack the glass envelope that moguls have. This means that the bulbs high output emits harmful UV-A and UV-B rays, which requires the use of a protective glass between the bulb and tank. The glass requirement and double sockets fixture makes DIYing a bit a bit more difficult.
On the otherhand, double-end bulbs lack the glass envelope that moguls have. This means that the bulbs high output emits harmful UV-A and UV-B rays, which requires the use of a protective glass between the bulb and tank. The glass requirement and double sockets fixture makes DIYing a bit a bit more difficult.
GratefulDiver":3dvsivng said:
I can't get over your avatar, I'm cracking up over here!
:lol:
I just buy completed fixtures, and I like the DE's. More output per $$$ spent on power. More bang for the buck. However, if I was setting up an SPS only tank right now, I'd use the 400w SE radiums. All the best SPS only tanks I've seen use those. My tank now is Euphulia, E. quads and mushrooms now though, so my 250w DE 20K's work out just right.
Jim
wstellwagen":ff71vkpa said:
I don't believe that is the case. Often the DE bulbs come in a pendant with a reflector, but the bulb itself doesn't have one. But you may be talking about something I have never heard of.
There is a DE bulb built into a mogul spot light style bulb, but it is new and only comes in 70 and 150 watts.
I run 4 250 DE and 1 150 DE in pendants and I like them better than moguls because it is real hard to break the bulb with splash.
That a 250 W DE is equivalent to a 400 W SE is ludicrous. Why would anyone buy the SE ? Why do the makers state approximately the same lumens/watt (you could sue.....) ?
This is an urban myth amongst reefers, speak to a lighting professional. You think they throw away millions of dollars pa because SE lamps are "cool" ?
Having said that, a smaller lamp facilitates making a reflector which can concentrate light. In particular, most SE reflectors are made for industrial/"botanical" applications, where spreading light thinly over a wide area is preferred to concentrating it.
That results in low par, unless you take measures to "trap" the light.
But don't blame the lamp. It is the same physics.
kim
This is an urban myth amongst reefers, speak to a lighting professional. You think they throw away millions of dollars pa because SE lamps are "cool" ?
Having said that, a smaller lamp facilitates making a reflector which can concentrate light. In particular, most SE reflectors are made for industrial/"botanical" applications, where spreading light thinly over a wide area is preferred to concentrating it.
That results in low par, unless you take measures to "trap" the light.
But don't blame the lamp. It is the same physics.
kim
The difference between 250w DE and 400w SE is that the DE has a less lighting area for the high par then the 400w. So all of your high light coral have to be all bunch up in the center if you are running DE.
DE bulb is not cooler then SE to touch. The SE spreads the heat out over a larger area, whereas, DE saturates heat onto a smaller area making the bulb definitely hotter. But it might be cooler system wise like MH are cooler then fluorescence bulbs even though fluorescence bulbs are cooler to touch.
DE bulb is not cooler then SE to touch. The SE spreads the heat out over a larger area, whereas, DE saturates heat onto a smaller area making the bulb definitely hotter. But it might be cooler system wise like MH are cooler then fluorescence bulbs even though fluorescence bulbs are cooler to touch.
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