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CORDLESS light with long burn time
- Thread starter Tigerpaw
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OP
Ah OK, so for cavern and wrecks use the goodman handle and for open water attach to bcd! Thanks!!!
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I want to provide some context about why I'd recommend not using a soft goodman handle or glove.
Your light is essentially your voice underwater. The way you move it passively communicates a lot to your team, acting as a link to promote team awareness. For example, if I’m on a team of three and I see two other beams, I know we’re all together. If one beam starts getting larger, it signals we’re separating and need to slow down. When the lights are moving slowly and remain stable, I know everyone is doing well. We can check on each other by making slow circles with our lights, get someone's attention with slow back-and-forth movements, or signal an emergency with rapid motions.
Light discipline is crucial, ensuring your light is always visible to your team and isn’t unintentionally signaling something you don’t mean to communicate.
Every time you need to adjust your buoyancy, you have to transfer the light from your left hand to your right to avoid blinding your team mates behind you and making it appear that you’re signaling, and a hard goodman handles make this much easier, allowing you to easily move the light to the temporary position, make your adjustment, and then place it back on your left hand. You don’t want the light permanently in your right hand, because if you need to donate gas or operate the light would blind your teammates, and that’s the hand that drives the DPV.
Many cave divers who use glove-mounted or helmet-mounted lights tend to have erratic light movements, which can be anxiety-inducing when you're accustomed to diving with teams whose lights remain stable, even when you just see them coming around the corner in a cave.
Your light is essentially your voice underwater. The way you move it passively communicates a lot to your team, acting as a link to promote team awareness. For example, if I’m on a team of three and I see two other beams, I know we’re all together. If one beam starts getting larger, it signals we’re separating and need to slow down. When the lights are moving slowly and remain stable, I know everyone is doing well. We can check on each other by making slow circles with our lights, get someone's attention with slow back-and-forth movements, or signal an emergency with rapid motions.
Light discipline is crucial, ensuring your light is always visible to your team and isn’t unintentionally signaling something you don’t mean to communicate.
Every time you need to adjust your buoyancy, you have to transfer the light from your left hand to your right to avoid blinding your team mates behind you and making it appear that you’re signaling, and a hard goodman handles make this much easier, allowing you to easily move the light to the temporary position, make your adjustment, and then place it back on your left hand. You don’t want the light permanently in your right hand, because if you need to donate gas or operate the light would blind your teammates, and that’s the hand that drives the DPV.
Many cave divers who use glove-mounted or helmet-mounted lights tend to have erratic light movements, which can be anxiety-inducing when you're accustomed to diving with teams whose lights remain stable, even when you just see them coming around the corner in a cave.
If you're ahead of the rig you don't need to do it quickly.
Wheeler925
Contributor
I ran a test on my Orcatorch ZD710 and got 10 hours and 10 minutes on a single charge on low. Their website claims 9:30 max..
Kendall Raine
Contributor
Lithium ion (including LIPO) rechargeable battery carry-on limits are established in watt hours (v DC x Ah)-max 160 Wh w/airline approval. Lithium metal (non-rechargeable lithium) are established in grams of content. Also, batteries must be in conformity with testing standards under UN 38.3. I have not seen anything recent (i.e. last decade) which uses both sets (Wh and grams) of limits for the same chemistry.
In the US these are laid out in CFR Title 49 Section 175.10 (a) (18) and are the basis for the FAA/TSA limits. Note dive lights have their own section (CFR Title 49 175.10 (a) (14)) which concerns their ability to produce heat. In that case both the heat and the battery chemistry are the hazards. If the battery can be disconnected from the lamp head heat is no longer a hazard and you're left with battery chemistry as the only hazard and 175.10 (a) (18) applies. There are the same as standards for IATA and form the basis for limits set by non-US airlines.
I have never found an airline which has different standards. Even in Mexico, which over the years has used some pretty whacky battery standards, Mexican airlines follow the IATA limits.
FWIW, the only time I ever encountered a security question on this watt hour issue was in Tokyo when the security agent read the specs on the outside of the canister to determine that the battery (a LM 20.8 Ah canister) was below the 160 Wh limit. It was and no problem.
That said, it's worthwhile carrying a copy of the regs on your phone in case you come across the security agent who is both ignorant and conscientious.
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