When is the time to change to a new BLV bulb

[andysho]

Can anyone advise when is the right time to change

to a new bulb~? how to judge from its condition

what proper measure should be taken

when change to a new bulb to advoid

shock to sps corals

[Achilles Tang]

A typical MH bulb that is not overdriven can last about a year before the spectrum shifts and intensity drops.

Light acclimatization can be done by cutting down the photoperiod by half and slowly bringing it back up an hour every day over a week or more. Or you can shield the bulb with a few thin layers of guaze/linen or maybe your car windscreen foldable shade.

You certainly don't want to bleach your SPS!!

[Achilles Tang]

Oh... forgot to check... if they are blue bulbs... they usually changing out earlier than the other lower k bulbs....

[nicken]

meaning 20K bulb needs to be change earlier than 10 & 14k is it ?

[Achilles Tang]

Yup!

[nicken]